Jason Colavito has a worthwhile post on this infamous “proof” for UFO visitation. The whole idea of a “UFO Battle” derives from the woodcutting shown here (courtesy of Wikimedia commons). Jason’s post tells you a few things about the origins of the woodcut that the UFO community won’t tell you, so have a look!

Personally, it looks more like “Battle of the Gum Drops and Pez Dispensers” to me.