Nagaland. This advance on the mainland of South Asia reached its farthest point on India territory, with the Japanese finally retreating from the Battle of Kohima and near simultaneous Battle of Imphal in June 1944. Recapture of Axis-occupied territory In 1944–45 Japan was under heavy air bombardment at home and suffered massive naval defeats in the Pacific. As its Imphal offensive failed, harsh weather and disease and withdrawal of air cover (due to more pressing needs in the Pacific) also took its toll on the Japanese and remnants of the INA and the Burma National Army. In spring 1945, a resurgent British army recaptured the occupied lands. The invasion of Italy Indian forces played a role in liberating Italy from Nazi control. India contributed the third largest Allied contingent in the Italian campaign after US and British forces. The 4th, 8th and 10th Divisions and 43rd Gurkha Infantry Brigade led the advance, notably at the gruelling Battle of Monte Cassino. They fought on the Gothic Line in 1944 and 1945. Royal Indian Air Force During World War II, the IAF played an instrumental role in halting the advance of the Japanese army in Burma, where the first IAF air strike was executed. The target for this first mission was the Japanese military base in Arakan, after which IAF strike missions continued against the Japanese airbases at Mae Hong Son, Chiang Mai and Chiang Rai in northern Thailand. The IAF was mainly involved in strike, close air support, aerial reconnaissance, bomber escort and pathfinding missions for RAF and USAAF heavy bombers. RAF and IAF pilots would train by flying with their non-native air wings to gain combat experience and communication proficiency. Besides operations in the Burma Theatre IAF pilots participated in air operations in North Africa and Europe. In addition to the IAF, many native Indians and some 200 Indians resident in Britain volunteered to join the RAF and Women's Auxiliary Air Force. One such volunteer was Sergeant Shailendra Eknath Sukthankar, who served as a navigator with No. 83 Squadron. Sukthankar was commissioned as an officer, and on 14 September 1943, received the DFC. Squadron Leader Sukthankar eventually completed 45 operations, 14 of them on board the RAF Museum's Avro Lancaster R5868. Another volunteer was Assistant Section Officer Noor Inayat Khan a Muslim pacifist and Indian nationalist who joined the WAAF, in November 1940, to fight against Nazism. Noor Khan served