Silver River pack, was once the biggest pack in the north, especially when Chaos killed almost all the male shifters of the Red Moon pack that caused all the female members and those, who survived the attack to blend with Anthony's pack.
However, after five months of their encounter with the members of The Hound and their battle, their number dwindled significantly and only left around two hundred of them.
They were forced to leave their land and moved to the eastern pack, joining forces with them to prepare for a counter- attack against humans.
Just as Anthony told Blue it was best for Anne to not live with the shifters, since their hostility against humans was very thick.
They would scoff in disgust whenever they talked about how human waged this unexpected and unscrupulous war against them.