After he discovers that it has been snowing, Donald dons his overcoat to go sledding and discovers Huey, Dewey and Louie building a snowman. After Donald deliberately ploughs into it the three decide to build a new snowman around a rock, one heckling their uncle. After Donald almost knocks himself out smashing this one, he chases the boys to their snow fortress, where they hide. Determined to get his nephews, Donald builds his own boat-shape fortress and the two factions begin a less-than-friendly snowball war.