OK here's how I'll give it a go using my Battles on a Budget rules. Each side gets 12 units. To represent Alexander's genius the table will be clear of terrain, a nice flat plain, with secure flanks of a river on one side and mountains on the other to eliminate hidden units and nasty flank surprises that Hannibal favors. Alexander will deploy first using his usual right side favored formation as follows:
Prodromoi Light Cavalry trained unarmored melee
Companions Formed Cavalry elite armored melee
Hypapists Formed Infantry elite armored melee
Phalanx X 4 Close order Inf. trained light armor pike
Heavy Peltists Unformed Inf. mercenary light armor melee
Thessalians Formed Cavalry veteran light armor melee
Thracians Light Cavalry mercenary shielded javelin/melee
Psiloi X 2 Light Infantry levy shielded javelin
Hannibal now gets to deploy to best exploit his opponents formations. His units can be deployed in any manner using the following:
Balearic slingers Light Inf. mercenary unarmored sling
Lybian javelinmen Light Inf. levy unarmored javelin
Numidian Cav X 2 Light Cav. mercenary shielded javelin/melee
Spanish Cavalry Unformed Cav. trained light armor melee
Gallic Cavalry Unformed Cav. veteran light armor melee
Caetrati Unformed Inf. veteran shielded javelin/melee
Scutari Unformed Inf. trained light armor melee
Gallic Infantry Unformed Inf. trained light armor melee
African foot Close order Inf. trained light armor melee
Hannibal's Veterans Close order Inf. veteran armored melee
Elephant Elephant no moral heavy armor melee
Turn 1 & 2
Alexander orders a general advance. Mago attaches himself to the Gallic cavalry and immediately ride down the Thracian light cav. On turn 2 the rest of the left flank collapses as the Thracian infantry routs and the Thessalians are forced to fall back. The campanions square off against the elephant and take heavy casualties while the Numdians successfully melee with the prodromoi after a bit of skirmish fire.
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Turn 3&4
Parmenio attaches to the nearest phalanx, expands frontage and wheels to he left. Alexander attaches himself to his hypaspists and rushes to bale out the Companion cavalry. Together they defeat the elephant who rampages harmlessly back to the left (8 o'clock on a die roll)
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Turn 5&6
The Greeks advance in echelon. Parmenio wheels two phalanxes to protect the flank and effectively freeze Mago's cavalry units. Alexander attaches himself to the nearest phalanx and races towards Hannibal. The center units start to meet.
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The Campanions have pushed the Numidians from the table and turned to take Hannibal's veterans in the flank. The center is pushed back off of the table edge along with Hannibal who avoids capture.
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