Berserk: The Golden Age Arc II - The Battle for Doldrey (2012) on Netflix

Plot summary

Three years after he joined the Band of the Hawk, Guts fights alongside the company's leader, Griffith. Cut off from the rest of the band, he and Casca hold their ground against Adon and his soldiers, and Guts begins to wonder whether he should stay. To become Griffith's equal and a true friend rather than a follower, he would have to leave and pursue a dream of his own. Meanwhile the band is handed the task that has defeated every commander before it, the capture of the fortress of Doldrey from the Tudor Empire. Griffith's standing in Midland keeps growing, and the Hawks are asked to face an army thirty thousand strong.