How about March 24,1864 , dalton, ga. A snowball fight.i know it is mention in the book stonewall of the west about Patrick cleburne.IIRC it was one of Polk ' s brigades against one Go van's making it an Arkansas vs. Arkansas fight.
Edit - I'm inclined to think that the fight at Dalton was not the only snowball fight to take place during the war.
This question will not be counted in the scoring for March.
Hoosier