Petr Andreevich was drafted in February 1940 for the Finnish War. Then he was transferred to Ukraine. By this time he was already married and had three children. He began the Great Patriotic War at the age of 36. The first battle took place on June 23 in the Lviv region. There he was surrounded. Coming out of it, he retreated towards Odessa. Coming out of the encirclement, he took part in the defense of Odessa. He left Odessa with the last boat. When the boat was about 300 meters away, the Germans came ashore. Within a month, after the evacuation from Odessa, he participated in the defense of Sevastopol. There he was wounded and sent to a hospital in Novorossiysk. In a short time, having healed his wound in the hospital, he was included in the Kerch-Feodosia landing. On the night of December 29, a landing of the 44th army, which he was part of, landed in Feodosia. In April 1942, in the battles for the Kerch Peninsula, he was wounded and sent to a hospital in Tuapse. After the hospital at the end of June, he ended up under Rostov. At the end of July, he retreated from Rostov through Tikhoretsk, Kropotkin, Armavir, Nevinnomyssk, Mineralnye Vody to the Cross Pass. He defended the Krestovy Pereval until the end of 1942. At the beginning of 1943, as part of the Soviet troops, he went on the offensive along the same route as he was retreating. He advanced through the south of Ukraine in the spring of 1943 through Taganrog to Mariupol and Kherson. At the beginning of 1944 he attacked Odessa. In the area of the Razdelnaya station in March 1944, he was seriously wounded, and spent a long time in the hospital. In the summer of 1944, he returned to service after a hospital and was transferred to northern Ukraine to the location of the 1st Ukrainian Front. In the rank of foreman, he was appointed deputy commander of the reconnaissance platoon. In the fall of 1944 he fought in southern Poland. On January 12, 1945, he crossed the Vistula River in the Sandamir region. On April 25, 1945, units of the 1st Ukrainian Front reached the banks of the Elbe River north of Meissen. The first was the regimental reconnaissance, of which he was a member. On advancing, he was wounded by a shrapnel in his left leg. He was sent to the hospital, from where he returned home in September 1945. After the war he worked as a worker at the Inozemtsevsky wine factory.