Initially the host was subordinate to the military governor of the Amur Oblast and Primorye.
In times of peace, the Amur Cossack Host supplied 1 mounted regiment (4 sotnyas) and 1 platoon of local guards.
In times of war this contribution expanded to two mounted regiments,[1] 1 platoon of guards, 5 special and 1 reserve sotnyas and 1 infantry battalion.
During the Russian Civil War a significant number of the Amur Cossacks fought on the side of the Soviets.
There were also some small units that fought on the side of the White Movement, more specifically in helping to regain control of the Amur region.