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In page Battle of Rzhev, Summer 1942:

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The majority of the Soviet tank strength still lay in separate tank brigades that directly supported the infantry. 30th Army started the offensive with nine tank brigades with 390 tanks,[4] 31st Army had six tank brigades with 274 tanks, and 20th Army had five tank brigades and 255 tanks.[5] Behind these army-level forces were newly created tank corps, the 6th and 8th to the rear of 20th Army, and 5th Tank Corps behind 33rd Army.