The 9th Indian Infantry Division was formed on 15 September 1940 at Quetta, India before being transferred to Malaya. On 15 September 1940 the three original brigades of the division were the 15th, 20th, and 21st Indian Infantry Brigades.[2] The 3/17th Dogra Regiment from the 9th Division was the first British Commonwealth Army unit to see action against the Japanese at the Battle of Kota Bharu on 8 December 1941.[3] The 9th Indian Division fought a relatively successful defensive retreat down Malaya's east coast until the 22nd Brigade was cut off from the rest of the division at a demolished railway bridge near the village of Layang Layang in the state of Johore. Major-General Barstow was killed crossing the bridge, while attempting to contact the brigade. The 22nd Brigade was destroyed whilst trying to find another way to Singapore.[3]
What was left of the division was amalgamated with the 11th Indian Division.