They were pretty good fights in the episode. It's kind of weird the otherworlders were so full of themselves after having once beaten the severely weakened opponents inside the anti-monster/anti-magic field. I guess it just showed their lack of character.
They are soldiers of an invading army. It doesn't really matter if they are good or bad. If they win, they will write the history (and be the good guys), if they lose, they will be written off the history (as the bad guys). Those who grab a sword must be ready to die by a sword as well. They have got no right to complain.