Wednesday, April 27, 2011

Heraclea replay with Gordian Knot

Background
I am hoping to replay the battle of Heraclea using many rules.  I used 10 rules for replaying the battle of Callinicum, a mostly cavalry action. Gordian Knot is the first ruleset I am going to use for Heraclea. I did an overview of Gordian Knot.  The deployment and background to the Battle of Heraclea may be found here - Heraclea deployment.   As per previous replays, I will have a reasonable amount of detail on how the rules work early on, including occasionally calculating the die roll.  There is so little (i.e. none) information on Gordian Knot on the internet, this will give readers a basis on the rules and its mechanisms.

Changes for a 2'x2' board
The rules are geared for a 6'x4' table, playing with 4"x2" units and measurements in inches.  So, my cunning plan: divide all by 2.5, we get 4cmx2cm units, distances in centimetres and a game eminently playable on a 2'x2' board with units being a standard WRG element (although mounted will be a bit deeper but not that important in the rules).

Troops
Each unit for Heraclea conveniently breaks down into a unit in Gordian Knot.

Romans
4 Leves: Skirmisher infantry, javelin
4 Hastati/Principes: Trained Infantry, heavy infantry, pilum, good melee troops, shield
2 Triarii: Trained Infantry, heavy infantry, spear, good melee troops, good morale,shield
1 Light Infantry: Skirmisher Infantry, good melee troops, javelin, shield
2 Heavy Cavalry: Trained Cavalry, heavy cavalry, spear, good melee troops, shield
1 Light Cavalry: Skirmish cavalry, spear, javelin, shield
1 General, no special characteristics
 
Epirot
1 Hypaspist: Trained infantry, heavy infantry, pike, good melee troops, good morale, shield
3 Pikemen: Trained infantry, heavy infantry, pike, good melee troops, shield
1 Hoplite:Trained infantry, heavy infantry, spear, good melee troops, shield
1 Light Infantry: Skirmisher Infantry, good melee troops, javelin, shield
1 Skirmisher:Skirmisher infantry, bow, shield
1 Slingers: skirmisher infantry, sling
1 Agema: Trained Cavalry, armoured cavalry, spear, good melee troops, good morale,shield
1 Light cavalry: Skirmish cavalry, spear, javelin, shield
1 elephant: Elephant.
1 General with the characteristic Popularity Inspirational (+1 to recovery/rally within 12)

Note: Light Infantry I have represented as Skirmish infantry but being good melee troops.  This gives them the same move flexibility as Skirmishers, similar evade capability and are just a bit better in melee than skirmishers.  All the other infantry troops types made no sense (untrained are slow and inflexible moves, and tribal is really for warband-type infantry)
 
Deployment
I deployed as per my Heraclea deployment.  Pyrrhus is adjacent to the Agema; Publius Laevinus is behind the Triarii.
 

Deployment.  Romans to the bottom.

I did not replace some of the units with dummies as is possible in the rules.

Missions: The army mission for each side is Battle to Win which basically means be the only one left with units on the table.

Romans will go first to reward them for getting over the river, but then it will be as per the rules - roll for it at the start.

Lastly, markers for unit status:
one green bush behind a unit = disordered
two green bushes = wavering
one brown bush = fleeing

Tactics
The Romans will try and destroy the centre.  The pilum has a 50% chance of disordering the enemy unit on contact, and this will mean the pikes will be fighting at -3 (-1 for disorder and -1 for Romans now being superior infantry to the pikes and -1 for being unshielded as pikes have been shot with pilum).  And the Leves may be able to get in a few disorders which will help.  On the Roman right, the forces are equal, and on the left the Cavalry is facing the Agema and the Elephants, so will delay engaging the flanks.

The Epirots will be focusing on the their right flank - it is where they can get a local superiority and hopefully carry this into the flanks of the Roman heavy infantry. 

Turn 1
Roman
Romans move the Leves up and move the Hastati/Principes to the flanks slightly and ahead (oblique movement is possible to Trained infantry without becoming disordered, most others are disordered).  Haven't moved the Triarii as they have to be far enough behind so that if a Hastati/Principes flees, they do not get caught up in it.
 
Epirot
Epirots move up their flanks.  Archer unit shoots at a Leves (turn sequence is IGO-UGO and each player turn is move, shoot, combat). Leves are unshielded, need a 4+ - hit - Leves is disordered. Note: disordered is a -1 in combat (as if the Leves cares) and is removed by halting and not shooting or meleeing for a turn. But a disordered unit hit again wavers, which requires a rally roll.  A hit while wavering is a flee.  Slingers move up to within range (8) and achieve a hit on a different Leves unit.

Turn 2
Pyrrhus wins the initiative.
 
Epirot
Continue to move up the right flank - Agema now in charge range of the Roman heavy cavalry.  Shooting misses.

Roman
Moved up the centre units.  Two Leves charge the Slingers, who gets a free shot as the defender and miss.  The two Leves fire - one hit and the Slingers are disordered.  Now to combat (skirmishers are immediately disordered when entering combat) and modifiers for both sides are same.  For multiple units attacking an enemy, you roll a die for each attacking unit, and use the highest die. The end result of the skirmish combat is a tie. All units are disordered in a tie, but this has no effect as they are disordered on entering combat!  Note, the Slingers could have evaded (on a 2+) but would have gone behind the pike line and had no impact on the battle - better to see if it can take some Leves with it!

Shot from the Romans side of the left flank and centre.  Disorder is marked by a green bush behind the unit.

Turn 3
Pyrrhus wins initiative again.

Epirot
Agema charges the Roman Heavy Cavalry.  Agema is +1 cavalry, +1 superior armour, +1 good melee troops, +1 superior morale grade; Romans are +1 cavalry, +1 good melee troops, +1 flank support.  A difference of +1 for the Epirots.  The opposed dice roll sees the Romans lose and they flee. Combat is fast in Gordian Knot - you lose, you run.  Fleeing units can be rallied but then are wavering, rallying wavering troops makes them disordered, rallying disordered makes then ok.  So a flee is bad.
Note that melee is done later, but makes sense to report it here.


Light infantry move to the flank of the Leves to charge next turn.  A unit charged in the flank automatically flees.
Missile fire sees the disordered Leves waver (next level of disorder).
The slingers versus two Leves ends in a Leves fleeing.
 
Roman
The fleeing heavy cavalry fail their rally roll (a 4+ required) and so disintegrate.  The remaining heavy cavalry can charge the Agema in the flank (it is actually behind the flank line and cavalry can wheel once during a charge).  This would cause the Agema to automatically flee, which is good.  But the Agema have a good chance to rally, and the Elephants would charge the heavy cavalry in the flank and cause them to flee, leaving the Roman left flank wide open.  There are no movement restrictions in Gordian Knot about moving in front of enemy units.    Let's charge them in, an elephant on the flank is slower than heavy cavalry - maybe the battle will be over by then....


The Roman heavy cavalry charges the flank of the Agema while the Elephant waits it turn. 
 
Meanwhile, the fleeing Leves continue to flee - once they are further away than 12 from an enemy, they have a chance of recovery (1 in 6), at the moment they have none.  Skirmishers rally on a 6+, in this case this is modified by -1 for enemy in 12, +1 for friendly in 12, -1 for friendly routing within 12; effectively a 7+ o a 6 sided die.  By moving/fleeing more than 12 away, the 7+ is reduced to a 6+.
The one Leves that is not disordered, wavering or fleeing moves up to within Javelin range (2) of the Skirmisher bow and disorders them.
The Triarii turn and head for the Elephant (trained infantry can turn around for the cost of 1/2 move).  The rest of the army move forwards.
 
The battle so far - disorder is one green bush, wavering is two, fleeing is a brown bush.
 
Turn 4
Pyrrhus moves first again.

Epirot
Try to rally Agema with a 3+ (4+, -1 enemy in 12, +1 good morale, +1 inspirational general within 12) - pass.  Agema is wavering and turns around to face the enemy if they pursue or charge.  Moved Pyrrhus to be with the Agema to give it a bonus to rally from wavering next turn.  Generals give no combat bonus, but do give a rally bonus if adjacent.
Elephant charges the Roman heavy cavalry, which flees.
The Slingers rally from pursuit (which means they do not have to pursue).  Units pursue fleeing or disintegrated units until they pass a successful pursuit rally, which is not the same as the rally roll used to recover from disorder, wavering or fleeing.  They then shoot at the heavy infantry (require a 5+) who shrug off the stones.
Skirmisher with bow misses the Leves.
 
Romans
Fleeing Heavy Cavalry disintegrates.  Needed a 5+, rolled a 4.  The Triarii are 12.3cm away.  If they were within 12, the Heavy Cavalry rally roll would have been a 4+ instead and it would have survived and be wavering.
One fleeing Leves disintegrates, the other passes the recovery roll and is wavering.
Triarii manoeuvre closer to the Elephant; hopefully this will possibly slow down the Agema as well.
The right 2 units of heavy infantry charge the Slingers who stand to fight, get a shot in and disorder a heavy infantry unit.  Slingers flee.
The left 2 units of heavy infantry move up behind the Leves (to be protected from the bow and also the Roman line is outnumbered 4 units to 5 units and so will echelon to delay flanking.  The right 2 units will go in, and the left ones will hold their position.

End of turn 4

Turn 5
Pyrrhus wins the initiative for the 4th time in a row.

Epirot
Agema rallies, as does the Elephant - the Epirot right flank is back in business; and there is no Roman left flank opposing them - just the Triarii blocking a rear run on the main battle line.  Shooting sees the wavering Leves flee.
Elephant turns to face the Triarii (Elephants take all there movement allowance to turn) and Agema moves towards the battleline, and also out of the fleeing line of the Elephants, just in case they do so.

Post game note: The Agema and the Elephant should have halted for an entire turn to be able to rally from wavering or disorder.  They moved last turn so should not have recovered this turn.  I did this correctly later one, not sure why I missed it here - i did play the game over three weeks (time poor at the moment) so forgetting is understandable.
  
Roman

The general moves to the rightmost heavy infantry, who then charge the pikes (I want to see what happens!).  Pila throw - both hit! Pikes are disordered and also unshielded.
Romans: +1 flank support, +1 good melee troops, +1 superior infantry (disordered pikes are inferior to trained infantry), +1 enemy disordered, +1 enemy unshielded = +5
End Pike: +1 flank, +1 good melee troops, (note that undisordered pikes would normally get a +1 for superior armour) = +2
Other Pike: +2 flank, +1 good melee troops,  +1 enemy disordered = + 4
Epirots lose both combats and flee.  The Roman heavy infantry is disordered.
If the pikes were not disordered by pila, the modifiers would have been Romans +2, Pikes +4/+6. Likely a very different outcome.

The fleeing pikes

A Triarii will charge the Elephants to see how this works. The other Triarii moves to lend flank support (rules are not clear if flank support occurs if the flankers are not in front corner to corner contact, but I'll allow it.) (the other Triarii cannot charge as trained infantry can only straight charge.  Also note that infantry cannot charge facing cavalry/chariots, but can do elephants).
Triarii pila throw causes the Elephant to be disordered (considering a pila needs 5+ to hit, the only 3 pila throws so far have all struck home.  Wow.)
Triarii: +1 flank support, +1 good melee troops, +1 superior morale grade, +1 enemy are disordered, (elephants never count as unshielded so the +1 unshielded does not apply) = +4
Elephant: Would have got a +1 for being an elephant, except it does not count against undisordered trained infantry with spears...ah well, +1 superior armour = +1
Elephant flees (no surprise).  There is no movement rate for fleeing elephants given but I assume it is the same as the equivalent infantry move.

The triumphant Triarii

Turn 6
Romans win initiative, the first time since being given it on turn 1.

Romans
Winners of melee must pursue and can only be stopped, starting before the first pursuit, by a pursuit rally roll.  Triarii  fail this (needed a 3+) and must pursue the Elephants.  They use the bonus 2 of movement for infantry charging and hit the Elephants in the rear, who continue to flee. Note, using the bonus makes you disordered if not already, but the Triarii are.

Post game note: There is nothing in the body of the rules specifically about what happens if you contact a fleeing unit in the flank or rear.  Contacting a unit on flank or rear causes it to flee, so I assumed the enemy will continue to flee.  But after the game I re-read the game report that is at the back of the rules and there is one bit where a fleeing unit is contacted in the rear and it is destroyed.  This makes more sense.  So the Elephant would have been destroyed rather than fleeing.  I did this error a couple of times later.  It did not have any effect in that the unit contacted that fled again rather than destroyed was usually destroyed the next turn.
 
The heavy infantry will only pursue if they roll a 1.  They roll a 1.  The other heavy infantry does not pursue but decides to move forwards anyway in line with the other heavy infantry. They contact a fleeing slinger, who flees.
The left heavy infantry block move sideways slightly (trained infantry can do this and not be disordered).  They do this so they can cover all three opposing pike units if they charge.  Currently the Hoplite unit would not be contacted, and would be free to flank a heavy infantry. Units in contact do not have to line up in corner to corner. Well there is nothing in the rules that says they do, so I assume they don't.
 

The Heavy Infantry after moving sideways to charge all three enemy units

Shooting - The wavering bowman flees after taking another hit (from a Leves).

Epirot
Elephant fails to rally and is destroyed (would have fled off the board this turn never to return, so it was worth trying for the '6' that was required to rally).
One of the fleeing pike units fails to rally, the other is successful.  As per elephants, they would have fled off the board if I did not attempt a rally.  The successful pike unit turns around.
The two fleeing skirmishers also fail to rally and are destroyed.
The Agema move towards the main battleline.  The Hoplite and two pike units move directly backwards 2.  Trained infantry can do this without being disordered.  This puts them 7 away from the facing Roman heavy infantry - with a move of 6, the will have to charge (and become disordered) if they want to do combat next turn.  It is a delaying tactic, that either forces the Roman's to charge and be at a disadvantage in combat, or wait another turn, which gives the Agema another turn to move up on the flank (the Agema is two moves away).

State if play at the end of turn 6
 
Turn 7
Romans win the initiative.
 
Romans
No successful rallies. Triarii stops pursuing the Elephant (needed to pass a pursue rally roll) turn and start moving towards the battleline. 

Tough choice (see above) on whether to charge into the pikes and fight disordered, or gamble that Initiative is won again, and the Agema hit the flank after the charge.  Romans charge in.  The other block of heavy infantry (on the right) charge in the wavering pikes. The general is moved to be adjacent to the leftmost charging heavy infantry.
The charging infantry melee (3 Epirot units against 2 Roman).  When a unit is in contact with two or more units, you work out the score for each contacted unit, and use the highest score.
Pila throws disorder the middle pike unit.

Left Roman unit rolls a 3, Facing Hoplite rolls a 1, as does the disordered pike (who is also counted as unshielded).  Roman modified score is a 5, Hoplites are a 5; Pikes, being disordered, will not be that high so don't bother to work it out. It is a draw.  Result is that all are disordered.
Right Roman unit rolls a 1, undisordered pike rolls a 2.  Roman modified score is 3 (flank support, good melee troops) , Pike is 6 (flank support, good melee troops, superior armour, superior infantry).  Romans flee (and the general goes with them).  The skirmishers behind the fleeing infantry also flee.
 
The battle line after the Roman unit flees
 
The other clash sees the Romans win and the pike flees off the board.
 
Epirot
The Pikes that won pass a pursue rally check so they do not need to pursue.

The Agema can reach, by using a +4 move charge bonus, the fleeing Heavy Infantry unit.  This has a two fold effect - one is the Heavy Infantry unitwill flee towards the light infantry (I was trying to hem them in but as my note earlier, the Heavy Infantry unit should have simply been destroyed when contacted by the Agema) and secondly, the Heavy infantry in contact with the hoplite/pike, if fleeing, will be destroyed instead, as a fleeing unit must flee directly away from all known enemy.
Hoplite and Pike in combat with the Roman heavy infantry results in an Epirot win. The heavy infantry must flee, but is destroyed because the Agema is blocking the flee path.


The Agema on the left, the uncontested pike line and the fleeing Heavy Infantry unit

Turn 8
Epirot win the initiative.
 
Epirot
A pike unit that saw no combat in the last Epirot turn has its disorder removed.  The other pike and Hoplite fail pursuit rally roll and move forwards.  Units will pursue a fleeing enemy, even if it is destroyed.  The only was to stop pursuit is to pass a pursuit rally roll.
Agema fail their pursuit rally roll and pursue the  Heavy Infantry unit, who are destroyed with no valid flee path.  The general passes the potential death roll for being adjacent to a destroyed unit.

Roman
General moves to Triarii. Other than fleeing units, no other units move so that disorder can be removed.

End of turn 8
 
Turn 9
Romans win initiative.

Roman
Remove disorder from all units that are disordered and move units towards the Epirot battleline.

Epirot
Hoplite and pike still fail pursuit rally (and all they need is a 3+) and are now about 2 away from a Triarii.  Agema turn around ready to flank charge Triarii.  Move up the lonely pike away from the heavy infantry behind it.


The centre mess

Turn 10
Epirots win initiative.

Epirot
Agema charges fleeing Heavy Infantry unit in the flank and they flee.  Yay, the Hoplite and Pike stop pursuing and the third lagging pike unit moves up to form a line.

Roman
Tried to rally fleeing Triarii and they fail and are destroyed (note they should have been destroyed a turn or so ago when contacted while fleeing). The General survives. The other Triarii charges the Hoplite in the flank and the Hoplite flees.  But now the Triarii can be hit in the flank by the Agema.

With nothing able to stop the Agema running into the flank of all the Roman units, I will concede as the Romans.

End of game

Verdict
An interesting game. If I wasn't taking notes, and looking up unfamiliar parts of the rules, I would say it took about 1.5 hours to play.  So it did not meet the goal of playing under one hour.  But is was a good game.  As I said in my overview, the combat is quick and unit status is a focus of the game.  I liked it although keeping track of status and trying to remember if the unit can rally or not was a bit of a chore.  The different movement options for unit types was a little hard on my brain too.  But really, these are only minor quibbles.
 
The lack of army lists is a downside, but no different to other rules I have tried, and for historical battles it is not difficult to figure out what is what.  I would recommend giving them a go - they do produce a fun game.

Monday, April 25, 2011

Gordian Knot rules overview

Background
Gordian Knot is a set of Ancient wargame rules written by Richard D Watts, copyright 2004, and published by Agema.  It is available at Agema's website, which will not tell you much at all about the rules, other than how much: 7 pounds + shipping.
 
I haven't found anything else about them anywhere on the internet.

What you get
It is 30 A4 pages stapled together with a  thick paper colour cover.  No army lists - the author thinks you could put together anything for any army so provides a comprehensive point system. Categorising units is up to you.  What I do like is the last 7 pages are a quite descriptive, blow by blow writeup of a game, from unit selection, thru terrain and deployment to game end.  It contains good detail on how the rules work, and also provides some notes on why things the way they are.  There are no terrain rules, but there is a simple terrain selection system buried in the game replay.

Base sizes, dice and measurements
Units are all based, for 15mm to 28mm, as 4" wide by 2" deep. 6mm is 2"x1". Ranges are all in inches and the two options for 6mm and 15mm/28mm are always given.  Dice rolls are all single d6.  Table size is not given, but the replay is on 6'x'4' with 28mm, was a small game and only seemed to take up 2/3rd of the table, although there were a lot of cavalry archers on each side. 

Game sequence
Game sequence is a roll for initiative (no modifiers), winner moves, shoots, combat; then other player does the same.

Units
Units are cavalry, infantry, chariots, elephants or artillery. 

Cavalry and infantry units are classed as trained, untrained, tribal or skirmish. Each class acts very differently.  The class of the unit affects movement rate, the modifiers in combat, target class for shooting, chance of pursuit, chance of evade and chance to rally.

Unit morale is good, average or poor.  A little bit of a modifier in combat, but mainly affects the chance to rally units.

Units may also have some special abilities such as good melee troops (add 1 in combat), good shooters (+1 to shoot), pike armed (affects various combat modifiers) and special training against elephants/chariots (can let these troops pass though unit rather than engage in combat).

Unit status
Unit status goes from good, to disorder (-1 combat modifier) to wavering (cannot advance into combat and not good in combat) to fleeing (running away) to rout.  A unit recovers from disorder by not doing anything for a turn while not in combat.  Units routed are lost.  Units fleeing may attempt to rally (based on morale) - pass and are wavering, fail and they rout - interesting.  Wavering units can go to disordered by doing nothing for a turn and passing a rally test.
 
These unit status's are a core component of the game.  A disordered unit suffers a -1 in combat, but also depending on the troop type, can be even worse e.g. ordered pikes are superior to any other infantry troop type, but if disorders are inferior to any other infantry troop type, and so suffer another -1 in combat.  Ordered pikes also are classed as having superior armour, so if disordered, they lose out on the +1 superior armour bonus.

Wavering troops cannot advance, and need to rally before they can do so.  A rally check is a 3+ for trained infantry, and a 6+ for a skirmisher. So wavering troops sometimes waver for a few turns.

Fleeing is worse.  A unit that loses combat flees, so combat is fairly decisive.  A fleeing unit that fails a rally check is destroyed. There is no other way to stop a unit fleeing except by passing a rally check.  A fleeing unit contacted by an enemy is destroyed.  A unit that flees is in a bad state. 

Movement
Fairly standard movement rates e.g. infantry 6", cavalry 10". There are a number of spefici rules on turning, oblique movement, stepping back etc that is specific to unit types e.g. trained infantry can go sideways without being disordered, but other units are disordered when doing so, except skirmishers, that cannot move sideways (this is probably the one with the most exceptions).  I found this actually the hardest part of the rules - who can do movement other that straight ahead and what type of movement and are they disordered or not.

Shooting
Shooting is fairly standard -  look up range and type of weapon and roll greater than a number on a d6 to hit.  If you do, enemy goes down a status for each hit.  Charged units can fire.  There is a table with 4 groups of missile types and 10 different troops types. Cross referencing gives you a score on a d6 required to hit (and also the score for an unshielded target).

Combat
Units do not have to line up corner to corner when meleeing.  When a unit charges into combat, the enemy can evade.  There is an evade roll - if you fail, you are assumed to have failed combat and flee.  Skirmishers have a evade roll of 2+, others are worse.  Charging in the flank/rear causes enemy to flee (bit strange as a skirmisher could flank charge heavy infantry and the latter would flee.  The only really weird omission I have seen by just looking at the rules).

Combat is an opposed roll.  If you lose, you flee. If it is a tie, both are disordered is not already.  So combat is harsh!  But good troops have a good chances to rally.

Units don't have specific combat factors but there is a list of about 20 combat modifiers - better armour, better morale, if cavalry, elephants Vs cavalry, enemy disordered etc.  The two modifiers that stand out as different are +1 for superior cavalry and +1 for superior infantry.  There is a list of cavalry units/status in order of superiority so lancers moving into 1st turn combat are superior to spear armed trained that are superior to spear armed tribal etc.  Disordered/wavering troops are low down the list.  For infantry, Pike 2 deep are superior, followed by pike 1 deep, but pikes disordered/wavering are lowest in the superior list.  Most units also get +1 for each friendly unit on its flank.

A unit that caused an enemy to flee must pursue.  The only way to stop pursuit is to pass a pursuit rally check (not the same as a rally check). 

Missions
Each side has one of 20 missions that are all fairly different and determine deployment and victory conditions.  Examples are destroy half of enemy, occupy with half your units the other side of the table, start game with half troops deployed and move on one unit per turn. etc.  Each side knows what the other mission is.  An interesting variation of a straight battle.

Visibility
The other difference from many other rules is visibility - units have a visibility of 24" (36" on hills).  Decoys can be placed instead of units further than this from the enemy. At deployment, you may place additional decoys (up to 1 per real unit). You may choose to place the real units at anytime (or reveal decoys), but are only forced to when they become visible.  All decoys move at 2d6" per turn - so random movement is the downside to decoys and it is impossible to maintain a battleline of decoys.

Generals
Each army has one general who, if killed, drastically reduces the number of units that can be moved.  Also, general have random characteristics that give them good/bad abilities (e.g. cannot move as far, there own visibility is enhanced/reduced).  Generals do not affect combat rolls, but do have a +1 to all rally rolls.



Verdict
A good solid set of ancient rules.  They are not simple but neither overly complex. Each ruleset has a focus, and this one is on unit status - disorder, wavering and fleeing troops rule what a unit can do.  Combat is bloody - you lose, you flee.  I like that.

Friday, April 1, 2011

Heraclea deployment and background for replay

This is a place to put the background and default deployment for the Battle of Heraclea as I start replaying it with multiple rules, aiming for less than 1 hour on a 2'x2' board.  It saves having to repeat this information with each battle.

Internet Sources
There are the internet sources I found quite easily to help on replaying the battle.

Scaling the troops

Armed with the potential numbers of the different types of troops present at Heraclea, I could start to convert this into possible units for the replays.  The less the better!  Going by the actual numbers, and trying scale it down to manageable unit sizes, I used a first cut scale of 1200 soldiers equals 1 figure.
 
Romans
4 Legions each with:
1200 Leves
1600 Hastati
1600 Principes
800 Triarii
gives:
4800 Leves = 4 figures
6400 Hastati = 5 figures
6400 Principes = 5 figures
2400 Triarii = 2 figures

The 4 figure Leves would translate to 2 Skirmishers bases
The 12 heavy infantry would really be 3 bases but could simply make it 1 base per legion.  But in the spirt of trying to have a small number of units or the game wil take longer, I will go with 3 bases in total: 2 bases of Heavy Infantry + 1 unit of Triarii.  I can always change it back if all goes bad.
The 4 allied legions I will treat identical to the roman legions - 2 Leves, 2 HI, 1 Triarii.
Bruttians etc Allied infantry 2400 = 2 figures or 1 Light Infantry base
Roman Cavalry 1200 + 3600 Legion Cavalry = 4800 = 4 figures or 2 bases (could be one but 1 seems too little for the role they played)
Light cavalry 1200 = 1 figure or 1 Light Cavalry base.
 
Epirot
Hypaspists 3000 = about 3 figures or 1 Hypaspist base
Pike Phalanx/Peltasts 20000  = 16 figures or 3 bases Pikes and 1 base Peltasts
Heavy Cavalry 3000 = 3 figures or 1 heavy Cavalry (Agema) base - I thought about adding a second heavy vavalry base but really the Romans had 60% more cavalry, so 1 it is.
Foot Archers and Rhodian slingers 2500 = 2 figures or 1 base of skirmishers
Elephants 20 which will be 1 elephant base
Tarantine Levy Hoplites 6000 = 4-5 figures = 1 Hoplite base
Tarantine Light Cavalry 1000 = 1 figure or 1 Light Cavalry Base.
There are not enough skirmishers at this scale but the Rhodian slingers, even though only 500, get converted to base of Skirmishers, for a total of 2 Epirot Skirmishers.
 
Troop Definitions
General troop definitions to assist with converting to the various rules.
 
Romans
4 Leves: Skirmishers, open order, javelins, no armour, no shield
4 Hastati/Principes: Heavy Infantry, close order, partial armour, pila, sword, shield.
2 Triarii: Heavy Infantry, close order, partial armour, spear, shield, veteran.
1 Light Infantry: Light Infantry, loose order, no armour, javelin, shield
2 Heavy Cavalry: Heavy Cavalry, loose order, partially armoured, spear, shield
1 Light Cavalry: Light cavalry, open order, unarmoured, spear, shield
 
Epirot
1 Hypaspist: Heavy infantry, Pikes, partially armoured, phalanx, veteran/elite, shield
3 Pikemen: Heavy infantry, Pikes, partially armoured, phalanx, shield
1 Hoplite: Heavy infantry, long spear, half-armoured, hoplite, phalanx, shield
1 Light Infantry: Light Infantry, loose order, no armour, javelin, shield
1 Skirmisher: Skirmishers, open order, javelins, no armour, no shield
1 Slingers: skirmisher infantry, open order, sling, unarmoured
1 Agema: heavy cavalry, partial armour, spear, shield; better than the roman heavy cavalry.
1 Light cavalry: Light cavalry, open order, unarmoured, spear, shield
1 elephant: elephant, tower.
 
Deployment
I shall start the battle after Pyrrhus drew back the skirmisher line and the Romans had crossed the river.  It bascially means the fight is in the open with no terrain.  Also, there is no defined deployment of the troops so I have gone with a cross of the WAB replay, a bit of Richard Sides (from Ancient Historical Battles 1479BC - 378AD) a little bit of Bill Bank's Ancients and what feels ok.

Proposed deployment for Battle for Heraclea on 2'x2'.  Romans at the bottom.