Yes, but the crusades were a rather different setting, where the Christian world would unite against the muslims (for, really, more political reasons than "retaking the Holy City"). However, I was referring more to smaller wars, sometimes even internal, between two disputed counts or smaller entities. Looting occurred. Maybe I expressed myself a bit wrong. It wasn't /that/ common after all, but it certainly happened.
I think depending on what period you look at, merchants were more and more common for food supply.