I don't know the specific answer to your question, but last night I had my longbowmen and sherwood archers overrun a couple of units of pikemen after they had exhausted their ammunition.
I was watching this closely, having never seen pikemen in action before, and in this instance they held onto their pikes throughout - much to their detriment....
They were badly depleted, and I did have a unit of cavalry hovering in the background though, in case this makes a difference.
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