Wedge Formation

[Ironsword]

Slightly off topic, but just a quick question on something that has come up in this thread that I'm sure one of the more learned members will quickly be able to answer.

I use wedge sometimes with peasants, especially in the early period when peasants comprise a main force of most armies. They already die in no time, so why not get some kills first using wedge?

^^ In Melee, when does the difference between kills and capturing occur??