31 May 1943, he was appointed a CB on 5 August 1943. In early 1944, towards the end of Tuker's time in Italy, during the Battle of Monte Cassino, Allied commanders were engaged in a controversy regarding what action should be taken against the monastery at Monte Cassino. The Germans had declared it a military-free zone but many senior commanders were reluctant to believe that the Germans would not occupy such a strategically important position. Tuker had found a book dated 1879 in a Naples bookshop giving details of the construction of the monastery at Monte Cassino which his division was to attack. He wrote a memorandum to his Corps commander, Lieutenant-General Bernard Freyberg, concluding that it should be demolished to prevent its occupation. He also pointed out that with 150-foot (45 m) high walls made of masonry at least 10 feet (3 m) thick, there was no practical means for field engineers to deal with the place, and that bombing with blockbuster bombs would be the only solution since 1,000 pound bombs would be "next to useless". General Sir Harold Alexander, commanding the Allied Armies in Italy, agreed to the bombing (which did not employ blockbuster bombs) and the ruins were occupied by German forces which held the position until 18 May. Tuker commanded the 4th Indian Division until 4 February 1944 when he became seriously ill and for nearly a year took no part in the war. While recovering he assumed light duties as General Officer Commanding, Ceylon from March 1944 to September 1944, before becoming Chairman of the Frontier Commission in India. On 14 July 1945 he was put in temporary command of the IV Corps in Burma while Frank Messervy took leave for a month, taking part in the defeat of the Japanese at the Battle of the Sittang Bend a breakout attempt at the Sittang in July and August. For his service in Burma he received his final mention in dispatches in September 1946. Tuker reverted to his substantive rank of major-general and after taking some leave, became Commander, Lucknow District in November 1945. Knighted with the KCIE in the 1946 New Year Honours, he was promoted once more to acting lieutenant-general on 21 January and appointed General Officer Commanding-in-Chief, Eastern Command, India. Promoted to the permanent rank of lieutenant-general on 15 November 1946, he retired on 25 April 1948 and died in 1967. There