The Beretta M1915 was a semi-automatic pistol designed in Italy by Tullio Marengoni, and accepted into service with the Italian Army in 1915. The pistol, which used the 9mm Glisenti round, was developed at the request of the military after problems concerning cartridge power and reliability were found with the first automatic handgun in Italian service - the Glisenti Model 1910. Due to the demand for weapons after Italy entered World War I in 1915, the Beretta pistol was manufactured in high numbers alongside the earlier Model 1910. The weapon received some improvements post-war in 1919 and 1923, with its numerous variants serving as the standard service pistol in the Italian Army between 1923 and 1945.