I feel sorry for the soldiers. If they at least would have decided to kill civilians, have witnessed the peacefulness of those "monsters" and decided to kill them anyway, murder, rape, anything, I'd say, "Served them right." But most of them have been fooled and forced. I'm sure they have been told, that those are child-eating-demons, that flocked over at their "city" to kill everyone they love. And I bet most haven't enlisted because of the just cause, but because they have been told to do so by church and government.
Normally I'd say slime-boy/girl should go for their leaders, but this has been set up well. I know it's not fair nor just to resurrect your own beloved ones by killing so many others, that are also beloved ones of someone else, but...they are there and they want are going to kill more, if unchecked.
In the end it is also the fault of their warmongering failure of leadership, that made tactical miscalculations and prematurely send them into death.