The Batrachomyomachia or Battle of the Frogs and Mice is a comic epic commonly attributed to Homer.
The Mouse-Prince stops by the shore of a lake to drink, and encounters the Frog King. The Frog offers to show the Mouse his kingdom, on the other side of the lake, and the Mouse agrees. The Prince climbs onto the Frog King's back. In the middle of the lake, they are confronted by a water snake. The Frog dives, forgetting about the Mouse, who cannot swim, and the Prince drowns.
On the bank, another Mouse witnesses the scene, and informs the other Mice, who arm themselves for battle. A battle ensues, and the Mice prevail.