The weak economic state of Persia put Ahmad Shah and his government at the mercy of foreign influence; they had to obtain loans from the Imperial Bank of Persia.[clarification needed] Furthermore, under the Anglo-Persian Agreement, Persia received only a small fraction of the income generated by the Anglo-Persian Oil Company. On the other hand, the Red Army along with rebels and warlords ruled much of the countryside.On 21 February 1921, Ahmad Shah was pushed aside in a military coup by Colonel Reza Khan, Minister of War and commander of the Persian Cossack Brigade, who subsequently seized the post of Prime Minister.