<u>Because he ordered most of his generals to be killed before the war</u>
Explanation:
In June 1936, Moscow announced that eight senior Soviet military leaders have been arrested, convicted in a secret trial and then executed, including a Russian marshal and military theorist Mikhail Tuhachevsky, marking the beginning of a mass purge and physical liquidation in the Red Army.
Tuhachevsky was one of the foremost commanders of the Red Army during the post-October Civil War. The Great Purge is a series of campaigns of political repression and persecution that took place in the Soviet Union in the period 1936-1938. years. This campaign was conceived and managed by Stalin. It began with the cleansing of the Communist Party and government officials, the repression of peasants, and continued with the leadership of the Red Army, and the persecution of ineligible persons.
