In Italy, the last few M3 GMC were replaced by the M10. Although the M10 was incapable of dealing with the frontal arc of the rarely-encountered Panther tanks and Tiger tanks, it was sufficient against most enemy armor encountered in Italy, and against heavy tanks from the flank. The M18 was first deployed in the summer of 1944, and was not seen as a great success in the Italian theater; its high speed was only of limited use in the restricted terrain, and as a result it was effectively a slightly up-gunned M10.