Смоленское сражение
After completing the courses in September 1941, Mironov returned to the 107th Rifle Division and led it during the Battle of Smolensk. On 26 September, the 107th became the 5th Guards Rifle Division for its actions during the Battle of Smolensk. He continued to lead the division during the Battle of Moscow, the Kaluga Offensive and the Rzhev-Vyazma Offensive. In April 1942, he became the commander of the 7th Guards Rifle Corps, which fought in the late stages of the Rzhev-Vyazma Offensive and the Battle of Smolensk in 1943. On 19 January 1944, Mironov became the commander of the 37th Guards Rifle Corps and was promoted to lieutenant general on 22 February. He led the corps in the Svir-Petrozavodsk Offensive, where it captured Olonets. In August, the corps was converted to an airborne unit but reconverted to infantry in December. In February 1945, the corps was sent to Budapest and fought in the Vienna Offensive and the Prague Offensive. On 28 April 1945, Mironov was awarded the title Hero of the Soviet Union for his leadership of the corps, as well as the Order of Lenin.