Yeah, but war also often damages regions where battles are fought. This just reminds me about... 2nd? invasion, where Ar Agyr has fought long war against over half of the continent, bordering only 1 enemy. Those other realms sent small portions of their army other side of the island while their homes were tip top condition. When invasion started, AA had no chanche, border regions bad shape and some enemy roaming on our lands. It sucked, we had definately most effective war machine on whole island but we collapsed in few days... but such is life. I just wish these invasion things would start a bit slower and give heads up to those who are at war. BT has learnt this pretty well and most realms signed CF's immediatly.
But, just something to consider on future monster undead invasion plans.