It began as a challenge from St. Paul that was accepted by Minneapolis.
It ended with snowballs flying on cold and windy arena separated by a blue-tinged bank of snow, and it's unclear if anybody won.
But, boy, did they have a lot of fun.
St. Paul Mayor Melvin Carter and Minneapolis Mayor Jacob Frey assembled teams for the snowball fight, which had rules such as no hitting above the chest.
Another important rule: No one gets hurt.
And no one did, with at least one combatant (from Minneapolis) using a clear-plastic police shield to ward off the chilly missiles on snow-swept McMurray Field in St. Paul.