Hokuchin Unit is the 5th chapter of the Golden Kamuy manga.
Saichi continues to fight with the man who murdered the prisoner and identifies him as a soldier of the Seventh Division. Saichi comes to break his arm and when he was going to kill him he was interrupted by Asirpa and the man manages to sneak away, but Saichi throws his weapon against the man's head and he falls to a precipice.
Asirpa and Saichi plan to find a place to take refuge, but they assume that it will be dangerous to stay in one place, so they decide to move constantly from place to place. Meanwhile, they prepare a broth with the squirrels that Ashiripa hunted in the forest.
Somewhere soldiers rescue the murderer from the river and identify him as Ogata.