The Australian battalions attempted several local counterattacks as they attempted to shore up their lines. One such attack, saw the Bren carriers of the 2/18th Battalion conduct a mobile ambush. Nevertheless, the British Commonwealth forces steadily lost more ground, with Japanese penetrating to within five miles of Singapore urban centre, by 10 February capturing Bukit Timah. On 11 February, knowing that his own supplies were running low, Yamashita called on Percival to "give up this meaningless and desperate resistance". The next day the Allied lines attempted to stabilise along the Krangi–Jurong line on west side of the island, with an ad hoc battalion of Australian reinforcements being committed to hasty counterattack. This was eventually cancelled, but the battalion was not recalled, and it was later set upon by the Japanese 18th Division as the Japanese recommenced offensive actions. Meanwhile, the 27th Brigade attempted to retake Bukit Timah, but the attack was repulsed by stubborn defence from Japanese Imperial Guards troops.