After being wounded and treated in the hospital, he got to the 1st Ukrainian Front, then, artillery sergeant Nikolai Kazantsev was transferred to the 1st Baltic Front.
In 1944, he was awarded the rank of lieutenant and the position of platoon commander, then - battery commander. On May 7, 1945, Nikolai Ivanovich was shell-shocked and met Victory Day in the hospital of the city of Ivanovo.
During the war, he liberated Sevastopol (participated in the assault on Mount Sapun), Simferopol, Riga, Königsberg, Poland, and Czechoslovakia.
Order of the Patriotic War of the 2nd class, Order of Glory of the 3rd class, Order of the Red Star, medal "For the Defense of Sevastopol", medal
"For the Capture of Königsberg"