ship broke free from its moorings and became trapped in the ice. Badly damaged, it drifted with the ice for over six months before it broke free and its captain, Joseph Stenhouse, was able to sail it to New Zealand in March 1916. No one had heard from the stranded winter party at Hut Point for nearly two years. After journeying with the rest of the survivors of his own party to Argentina, Shackleton, along with Worsley, left for New Zealand. From here they hoped to find a ship to take them south to retrieve the Ross Sea party. Shackleton had brought Worsley along intending to use his services in the retrieval of the winter party. However, after their arrival in New Zealand in December 1916, they found themselves without a ship. They had expected to use the Aurora with Shackleton as its captain. In the meantime, the Australian, New Zealand and British governments had put forward funds for the rescue but, influenced by the explorer Douglas Mawson, who disliked Shackleton, the Australian government appointed its own captain. After protracted negotiations, Shackleton sailed on board the Aurora as a supernumerary officer. Worsley was left behind but was placated with a paid passage to Britain. The seven surviving members of the winter party were duly rescued. Worsley was later awarded the Polar Medal for his service on the expedition. First World War Shortly after Shackleton returned to New Zealand from the Ross Sea, having picked up the survivors of the winter party, Worsley travelled to England aboard the RMS Makura. As an RNR officer, he wanted to join in the fight against Imperial Germany. After arriving in Liverpool, he made his way to London and was quickly assigned to HMS Pembroke, the shore station at Chatham. Here, for three months, he learned about fighting U-boats, which were causing considerable damage to supply convoys crossing the Atlantic. Several tactics were deployed against the U-boats. One of these involved the use of Q-ships, small merchant vessels fitted out with hidden armament that could be deployed against any U-boats which surfaced and approached the seemingly unarmed ship. Another tactic was the use of P-boats, which were patrol boats that carried out convoy escort duties and anti-submarine work. The P-boats had a distinctive profile, and their effectiveness wore off as U-boat commanders began to recognise and avoid them. Later-built P-boats were designed with a more