 Complete the following phrase:  In April 1915 the British Admiralty requisitioned Alcantara and her A-series sisters , and Andes to be armed merchant cruisers. She was armed with eight 6-inch guns, two six-pounder anti-aircraft guns, and depth charges. On 17 April at Liverpool she was commissioned into the Royal Navys 10th Cruiser Squadron as HMS Alcantara, with the pent number M 94. Arlanza and Andes were also commissioned into the 10th Cruiser Squadron, which joined the Northern Patrol that was part of the First World War 