The 1st Mechanized Corps was a formation in the Soviet Red Army during World War II. Initially formed in March 1940 it was attached to the Leningrad Military District, & held in reserve near Pskov fortified region in Soviet Union It was under the command of Major General M. L. Cherniavsky when the German Operation Barbarossa began in June 1941. It initially comprised the 1st and 3rd Tank Divisions, & the 168th Mechanized Division. On 22 June 1941, 1st Mechanized Corps consisted 31,439 Men, 1037 Tanks, 239 Armoured Cars, 148 Artillery Pieces, 146 Mortars, 4730 Vehicles, 246 Tractors & 467 Motorcycles including lighter models T-26, Bt 7, & T-28's.