I found that there is actually a wiki page about the ogre wars. Rumpel was in the first ogre war. Granny’s six brothers and father were veterans of the second ogre war. Then we have Belle’s town or castle being surrounded by ogres with reports that other towns have recently fallen to the ogres, so that is possibly a third ogre war, though who knows about that. There might just be skirmishes with ogres all the time. Snow knows how to kill them after all.