The Army was originally limited to 16 infantry battalions and 2 cavalry squadrons – 16,000 men in total. The original 16 battalions were soon enlarged to 15 infantry regiments of two battalions each between May and June 1941, organised into five divisional commands, some 55,000 men. Support units included 35 light tanks supplied by Italy, 10 artillery battalions (equipped with captured Royal Yugoslav Army weapons of Czech origin), a cavalry regiment in Zagreb and an independent cavalry battalion at Sarajevo. Two independent motorised infantry battalions were based at Zagreb and Sarajevo respectively. Under the terms of the Treaties of Rome (1941) with Italy, the NDH navy was restricted to a few coastal and patrol craft, which mostly patrolled inland waterways.