These regiments would all play a prominent role during World War II. From the 14th Punjab Regiment, the 1st and 5th battalions were deployed in Malaya during the opening stages of the Southeast Asian theatre. The 1st Battalion, under the command of Lieutenant-Colonel James Fitzpatrick, was overrun by Imperial Japanese forces at Changlun during the Battle of Jitra. With only 270 survivors, the 1st Battalion was not reformed during the rest of the campaign. The 5th Battalion, under the command of Lieutenant-Colonel Cyril Livesy Lawrence Stokes, performed relatively well in the British invasion of Japanese Thailand in early December 1941. However, Stokes died in Japanese captivity on 15 February 1942, following the Battle of Slim River. The 5/14th Punjabis was forced to surrender along with the rest of the British Commonwealth forces after the Fall of Singapore to the Empire of Japan on 15 February 1942. However, a number of the Indian troops from both battalions later joined the Japanese-backed Indian National Army, and formed a part of the Hindustan Field Force.