The rank and file of the Brigade were always Caucasian Muhajir and later Persian as well, but until 1920 its commanders were Russian officers who were also employed in the Russian army, such as Vladimir Liakhov. Such secondments were encouraged by the Imperial Russian Government who saw the Cossack Brigade as a means of extending Russian influence in a key area of international rivalry. After the October Revolution in 1917, many of these Russian officers left the country to join the "White" forces. The command of the Persian Cossack Division was subsequently transferred to Iranian officers. Most notable among these officers was General Reza Khan, who started his military career as a private soldier in the Cossack Brigade and rose through its ranks to become a brigadier general.