Depictions of Underarm Phalanxes

[rrgg]

I'm trying to figure out how exactly an underarm spear formation would have looked when it did occur. Aside from the Chigi vase, are there any ancient depictions (Greek or otherwise) of how an underarm phalanx might have looked in battle?


Edit: I meant to put this in the 'Greek Military History & Archaeology' forum but I'll let a Moderator move it to wherever it's best suited