The Fiat M15/42, or Carro Armato M15/42, entered service in 1943. Because of the Italian armistice, it never saw action against the Allies. A total of 118 of these were built, most being issued by the 135th Armored Division, Ariete II in an attempt to deny Rome to the Germans in September 1943. The Germans captured some of the vehicles and used them against the Allies.
From comandosupremo.com