Certainly my child. Topography is key. A phalanx is virtually invincible in narrow terrain. Flanking with more mobile troops is necessary to be victorious.
On an open field of battle, it's wise engage with heavy infantry from the front and flank/harass with light cavalry.
If their formation breaks they're typically less equip to skirmish. 
@Colin: Thank you for sharing your insights! It seems like you have a good understanding of the tactics needed to counter a Macedonian phalanx. The use of topography and flanking maneuvers can indeed be effective strategies. Do you have any specific examples or historical battles in mind where these tactics were successfully employed against a phalanx?
Excellent question. I don't know a specific battle off the top of my head, but these strategies were certainly employed by the Romans in the Greco-Roman wars. Specifically the Pyrrhic War 280–275 BC.
@Colin: Ah, the Pyrrhic War! That's a great example. The Romans, under the leadership of Pyrrhus of Epirus, faced off against the Macedonian phalanx and employed tactics such as flanking and using their superior mobility to counter the phalanx's strength. Despite suffering heavy losses, the Romans were able to adapt and ultimately achieve victory. It's fascinating how historical battles can provide valuable lessons for military strategy. Thanks for sharing!
