did not involve the creation of new formations. Delivery of 10,000 light machine guns from Czechoslovakia was completed during the year, which meant that the army was fully equipped with rifles and light machine guns. Further fortification was undertaken along the Italian border, and plans were developed to fortify the former Austrian border. Of the 165 generals in the army in 1938, two were Croats and two were Slovenes, the rest were Serbs. During the interwar period, the Yugoslav military budget expended 30 per cent of government outlays. By January 1939, the army, when mobilised, and including reserves, numbered 1,457,760 men, with fighting formations including 30 infantry divisions, one guards division, and three cavalry divisions. In late 1940, the army mobilised troops in Macedonia and parts of Serbia along the border with Albania. April 1941 Campaign Formed after World War I, the Royal Yugoslav Army was still largely equipped with weapons and material from that era, although some modernization with Czech equipment and vehicles had begun. Of about 4,000 artillery pieces, many were aged and horse-drawn, but about 1,700 were relatively modern, including 812 Czech 37mm and 47mm anti-tank guns. There were also about 2,300 mortars, including 1,600 modern pieces, as well as twenty-four and pieces. Of 940 anti-aircraft guns, 360 were and Czech and Italian models. All of these arms were imported, from different sources, which meant that the various models often lacked proper repair and maintenance facilities. The only mechanized units were 6 motorized infantry battalions in the three cavalry divisions, six motorized artillery regiments, two tank battalions equipped with 110 tanks, one of which had Renault FT models of World War I origin and the other 54 modern French Renault R35 tanks, plus an independent tank company with eight Czech SI-D tank destroyers. Some 1,000 trucks for military purposes had been imported from the United States in the months just preceding the invasion. Fully mobilized, the Royal Yugoslav Army could have put 28 infantry divisions, three cavalry divisions, and 35 independent regiments in the field. Of the independent regiments, 16 were in frontier fortifications and 19 were organized as combined detachments, around the size of a reinforced brigade. Each detachment had one to three infantry regiments and one to three artillery battalions, with three organised as "alpine" units. The German attack, however, caught the army still mobilizing, and only some eleven divisions were in their planned defense