Aside from the attack on Ancona, the Austro-Hungarian battleships were largely confined to Pola for the duration of the war. Their operations were limited by Admiral Anton Haus, the commander of the Austro-Hungarian Navy, who believed that he would need to husband his ships to counter any Italian attempt to seize the Dalmatian coast. Since coal was diverted to the newer "Tegetthoff"-class battleships, the remainder of the war saw "Zrínyi" and the rest of the Austro-Hungarian Navy acting as a fleet in being. This resulted in the Allied blockade of the Otranto Strait. With his fleet blockaded in the Adriatic Sea, and with a shortage of coal, Haus followed a strategy based on mines and submarines designed to reduce the numerical superiority of the Allied navies.