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The Petersburg Military District (Питербургский вое́нный о́круг) was a Military District of the Russian Empire originally created in August 1864 following Order B-228 of Dmitry Milyutin, the Minister of War of the Russian Empire. The order, signed on 10 (22) August established that "for local control of the Ground Armed Forces and military establishments, are formed ... Military-regional administrations in the following ten military districts" of which one was Petersburg. The District’s forces gained combat experience in the Russo-Turkish (1877–1878) and Russo-Japanese (1904–05) wars. Finland Military District was merged into the Petersburg District in 1905.
By a decision of Emperor Nicholas II on 24 August 1918, the names of units and establishments within the District were changed to Petrograd Military District. This District was established as a part of the RKKA by order в„– 71 of the Highest Military Council of 6 September, 1918. On 1 February, 1924, by the order в„– 126 the Revolutionary Military Councils of the USSR the Petrograd military district was renamed the Leningrad Military District.