Quote Originally Posted by Watchman
It would seem to me that the Peltastai, being primarily skirmishers and light infantry, and the other two being primarily phalanx troops, might not necessarily be quite the optimal choice for the parts of siege assaults people usually want something definable as "assault infantry" for, ie. taking the walls and fighting through the breaches.

The likes of Thureophoroi and Hoplitai would seem to be rather better armoured than the Peltastai, and as non-phalanx troops better statted to the grind of cramped hand-to-hand combat that now tends to characterize these actions. Ditto for the Thorakitai.

That they don't use swords but rather spears hardly makes any difference, as the overhand spear has the exact same specs as the standard-issue sword the Hellenics favour.

Depends, of course, what exactly the opposition consists of and what troops happened to be along and available.
There are a few mentions of greek assault troops but those are pretty much of wealthier nobles assaulting in a heavy hoplite panoply and a kopis.
Most likely the same guys that in the field act as medium or heavy cavalry in sieges had the equipment to do some heavy melee job.