Following his ordeal on the basis of the Sikorski–Mayski agreement of July 30, 1941, Władysław Grydziuszko was released for the purpose of joining the Polish Armed Forces in USSR.

At Monte Cassino, the Polish Army was advancing against the Hitler Line,[2] and on May 23 the Poles finally managed to break through attacking the village of Piedimonte.

[3] During the battle, Grydziuszko was lightly wounded on October 17, 1944, and suffered minor spinal cord injuries from Nazi artillery fire.

Following the end of World War II, Władysław Grydziuszko was killed in an accident near Treia, Macerata, in Italy on January 29, 1946.

During a routine 2nd Armoured Brigade (Poland) training period, Władysław was killed when he fell underneath one of his tanks breaking his spine at the neck.