Berserk: Ougon Jidai-hen I - Haou no Tamago (Berserk: The Golden Age Arc I - The Egg of the King)
Guts is a young and highly skilled mercenary living in a medieval era of the Midland monarchy. During the siege of a castle, he catches the attention of Griffith, leader of a mercenary army called Band of the Hawk. As the two meet again, Guts ends up joining the notorious group.
[Source: Anime News Network]