fought through Japanese positions before running out of ammunition near Parit Sulong. The survivors were forced to leave behind about 110 Australian and 40 Indian wounded, who were later beaten, tortured and murdered by Japanese troops during the Parit Sulong Massacre. Of over 3,000 men from these units only around 500 men escaped. For his leadership in the fighting withdrawal, Anderson was awarded the Victoria Cross. A determined counter-attack by the 5/11th Sikh Regiment (Lieutenant-Colonel John Parkin) in the area of Niyor, near Kluang, on 25 January and an ambush around the Nithsdale Estate by the 2/18th Australian Battalion on 26/27 January bought valuable time and permitted East Force, based on the 22nd Australian Brigade (Brigadier Harold Taylor), to withdraw from eastern Johor (formerly Johore). On 31 January, the last Commonwealth forces crossed the causeway linking Johor and Singapore and engineers blew it up. Prelude During the weeks preceding the invasion, Commonwealth forces suffered a number of both subdued and openly disruptive disagreements amongst its senior commanders, as well as pressure from Australian Prime Minister John Curtin. Lieutenant-General Arthur Percival, commander of the garrison, had 85,000 soldiers—the equivalent, on paper at least, of just over four divisions. Of this figure, 15,000 men were employed in supply, administrative, or other non-combatant roles. The remaining force was a mix of front-line and second-line troops. There were 49 infantry battalions—21 Indian, 13 British, six Australian, four Indian States Forces assigned to airfield defence, three Straits Settlements Volunteer Force, and two Malayan. In addition, there were two British machine-gun battalions, one Australian, and a British reconnaissance battalion. The newly arrived 18th Infantry Division (Major-General Merton Beckwith-Smith)—was at full strength but lacked experience and training. The rest of the force was of mixed quality, condition, training, equipment and morale. Lionel Wigmore, the Australian official historian of the Malayan campaign, wrote Percival gave Major-General Gordon Bennett's two brigades from the 8th Australian Division responsibility for the western side of Singapore, including the prime invasion points in the northwest of the island. This was mostly mangrove swamp and jungle, broken by rivers and creeks. In the heart of the "Western Area" was RAF Tengah, Singapore's largest airfield at the time. The Australian 22nd Brigade, under Brigadier Harold Taylor, was assigned a wide sector in the west, and the 27th Brigade, under Brigadier Duncan Maxwell, had responsibility for a zone just west of the Causeway. The infantry positions