Persian Cossack Brigade, cavalry unit founded in Iran in 1879 and modeled after Russian Cossack formations. It began as a regiment and was enlarged within a few months to a brigade and later, during World War I, into a division.
The genesis of the Iranian brigade lay in the need for a reliable and well-disciplined fighting force. Impressed by the Russian Cossacks he had encountered during a recent visit to Europe, in 1878 Nāṣer al-Dīn Shāh (ruled 1848–96) asked the Russian government for help in the creation of an Iranian cavalry unit. Lieut.-Col. A.I. Domantovich was selected to assist in the organization of the requested force, and in 1879 its nucleus was founded in Tehrān, staffed by active-duty Russian officers under contract to the Iranian government. In its early years the brigade was essentially a ceremonial force, numbering only 400 men, but its numbers increased at the end of the 1890s. After the assassination of Nāṣer al-Dīn Shāh in 1896 the brigade was converted to an experienced elite guard to protect the shah and the dynasty. It was used increasingly as an internal police force and, as a result, became unpopular with Iranian nationalists, who considered it an embodiment of Russian foreign policy and internal despotism.
In June 1908 the brigade, led by Col. Vladimir Platonovich Liakhov and acting under direct orders of Moḥammad ʿAlī Shāh (ruled 1907–09), bombarded the Majles (parliament) as part of a plan to undermine constitutional government. In an ensuing civil war (1908–09) the brigade fought on the side of the shah. During World War I (1914–18) the brigade was expanded into an 8,000-man division and fought with the Russian government against an invading Turkish army and its Iranian allies; the war years saw increasing tensions within the division between the Russian executive officers and the junior Iranian officers. After the Russian Revolution of 1917 the Russian officers of the division were split into “Red” and “White” factions. The Russians departed in 1920, and Col. Reza Khan, one of its Persian officers (who later, in 1925, became shah of Iran), assumed command.
In February 1921 several detachments of the Iranian Cossacks, under Reza Khan’s command, carried out a coup d’état that made Sayyid Zia al-Din Tabatabaʾi prime minister. Late that year the division was amalgamated with other independent military units, thus forming a unified national army under Reza Khan. Many of the division’s Iranian officers rose to positions of prominence.