In January 1942, he was sent as the commander of the machine-gun crew of the machine gun to the Kalinin front, to the 91st rifle division. As part of the 117th guards rifle brigade, he took part in the Rzhev-Sychevskaya offensive operation, The Rzhev-Sychevskaya strategic offensive operation, where he bravely and skillfully supported the Riflemen during the battles from November 25 to December 2, 1942. "On November 26, I supported the Riflemen with my machine gun and broke into the enemy's trench with them. The Germans launched a counterattack, and only Grigoriev's machine gun remained in the trench. But he did not lose his head, machine-gun fire destroyed 25 Nazis. The rest lay down and retreated" - this was how his feat was described in the award list of the medal "for bravery". By the end of 1942, he received his first battle wound, fortunately it was light. A couple of months later, in February 1943, he was again wounded in the left shoulder. After receiving recognition of fitness for combat service, he returned to the battlefields, continuing to fight in the 91st rifle division. He participated in Kursk offensive operation, where in the battles for the height of 228, he received the medal "for military merit". In October 1943, he took part in Nevel operation and was wounded on October 6. Exactly a year after the first injury-a fatal combination of circumstances-he was again injured, and this time seriously. A through shrapnel wound to the face with damage to the lower jaw-this was the diagnosis, and the doctors found it was necessary to transfer him to the evacuation hospital in Kazan on December 2, 1943. Y He was in Tatar evacuation hospital until February 1944, where he was commissioned because of injury