 Complete the following phrase:  On 23 May 1915, between two and four hours after the Italian declaration of war reached the main Austro-Hungarian naval base at Pola, Radetzky and the rest of the fleet departed to bombard the Italian and Montenegrin coast. Their focus was on the important naval base at Ancona, and later the coast of Montenegro. The bombardment of Montenegro was part of the larger Austro-Hungarian campaign against the Kingdoms of Montenegro and Serbia, who were members of the Entente, during the first half of 1915. During the 