Not the point, I know, but you might want to talk to your DM about easing up on the throttle a bit. You've got an average party level of 6.6 (converting to a 4 character team) vs. an encounter level of 11, which the SRD encounter generator describes as overpowering.
I hope, at least, that the DM was using morale and evening the encounter by having some of the orc mooks run away when some of them went down.