Master of Ragnarok Ep-1 English Dubb

Yuuto Suoh, a young man who was transported to the world of Yggdrasil and became the patriarch of the Wolf Clan, leads his people into war with the Horn Clan alongside one of his Einherjars, Felicia. Using phalanx formations, which Yuuto knows about due to his knowledge of the 21st century, the Wolf Clan overpowers the Horn Clan. The battle ends in the Wolf Clan's victory when another of their Einherjars, Sigrun, captures the Horn Clan's patriarch, Linnea. Yuuto then threatens to burn the Horn Clan's capital to force her to become his sworn little sister, making her his vassal. After the battle, Yuuto contacts his childhood friend, Mitsuki Shimoya, in the 21st century using the cellphone he still possesses. Later, Yuuto and Linnea attend a ceremony where she becomes his sworn little sister. However, Yuuto then receives news that the Horn Clan is being invaded by the Hoof Clan, prompting him to come to their aid.