Kenpuu Denki Berserk - episode 11 - 16 Dec, 1997

Griffith and the Hawks lead the march into battle against the Blue Whale Knights. Casca has a fever, and after fighting with Adon Coborlwitz she falls unconscious off a cliff, Guts goes after her. They are washed downriver, and Guts finds a cave where he must keep Casca warm with his body. (Source: Wikipedia)