I don't remember much, I think it might have been in the 80's, but I know these kids have a snowball war, and there's also a huge snow castle/fort they made. That's about all I know, I've been trying to figure this out for years. Anyone know? Thanks

"THE DOG WHO STOPPED THE WAR is the story of a war game between two gangs of children in which the victor stands to win a magnificient ice castle."