Vinland Saga 1 by Makoto Yukimura

“The Viking invasion of London has reached a fever pitch, and Askeladd and Thorfinn rush to take part in the carnage! Their goal is the capture of Cnut, the son of King Sweyn Forkbeard and heir to the throne of Scandanavia and the Danelaw. But standing in their way is Thorkell, one of the Viking world’s most daring warriors. The defeat of a living legend will be a formidable test of Askeladd’s cunning and Thorfinn’s ruthlessness, and of their ability to set aside personal grudges and fell a common enemy!”