The second season of Vinland Saga. 
After his father's death and the destruction of his village at the hands of English raiders, Einar wishes for a peaceful life with his family on their newly rebuilt farms. However, fate has other plans: his village is invaded once again. Einar watches helplessly as the marauding Danes burn his lands and slaughter his family. The invaders capture Einar and take him back to Denmark as a slave.
 
Einar clings to his mother's final words to survive. He is purchased by Ketil, a kind slave owner and landlord who promises that Einar can regain his freedom in return for working in the fields. Soon, Einar encounters his new partner in farm cultivation—Thorfinn, a dejected and melancholic slave. As Einar and Thorfinn work together toward their freedom, they are haunted by both sins of the past and the ploys of the present. Yet they carry on, grasping for a glimmer of hope, redemption, and peace in a world that is nothing but unjust and unforgiving.
 
(Source: MAL Rewrite)

As a child, Thorfinn sat at the feet of the great Leif Ericson and thrilled to wild tales of a land far to the west. But his youthful fantasies were shattered by a mercenary raid. Raised by the Vikings who murdered his father, Thorfinn became a terrifying warrior, forever seeking to kill the band's leader, Askeladd, and avenge his father. Sustaining Thorfinn through his ordeal are his pride in his family and his dreams of a fertile westward land, a land without war or slavery … the land Leif called Vinland.
 
(Source: Kodansha USA)
 
Notes: 
- Won the Grand Prize at the Japan Media Arts Festival in 2009. 
- Winner of the 36th Kodansha Manga Award in the General category in 2012.

Thorfinn is son to one of the Vikings' greatest warriors, but when his father is killed in battle by the mercenary leader Askeladd, he swears to have his revenge. Thorfinn joins Askeladd's band in order to challenge him to a duel, and ends up caught in the middle of a war for the crown of England.
 
(Source: Kodansha USA)

Episode 6.5 of VINLAND SAGA SEASON 2.

 The short video depicts a scene not shown in the anime where Thorfinn, as he appears as a member of Askeladd's raiders, cuts down some men in the middle of a raid. When he enters a nearby house, he sees a family cowering within... 

(Source: Anime News Network, edited)

Episode 18.5 of VINLAND SAGA SEASON 2.
 
Additional clip of Ketil commanding the farm's warriors that leads in to episode 19.
 
(Source: Official Vinland Saga Twitter account, edited)

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