Lovely piece.

How about "Donnerkeil" (Thunderbolt), if you want to go for the martial way? With all those barrels, it´s bound to make quite some noise...
Or for a more funny approach, "Donnerlüttchen", which is a slightly dated word signifying appreciative surprise. Additionally, it could be interpreted as a "small thunder" ("lütt" being a dialect term for "small", related to english "little"), and finally, well, it´s got an Umlaut.
