Italy did not join the war until 1915, and did not have any industry designing artillery. It therefore used artillery designs from other countries, built in Italian factories. The Italians lost nearly all their artillery in the Battle of Caporetto, requiring a massive effort to rebuild, and also requiring supplies from allied nations. The Italians also used artillery that they captured from Austria-Hungary. After the war, the Italians seized most of the Austria-Hungarian weaponry, and some was still in service during World War 2.