On 16 April, almost 7,000 British soldiers, along with 500 prisoners and civilians, were encircled by an equal number of Japanese soldiers from the
IJA 33rd Division at Yenangyaung and its oil field. The 33rd Division was able to advance between Slim's 17th Division at Taungdwingyi and the 1st Burma Division south of Yenangyaung. Fearing that the
Burma Corps may become trapped, Slim called upon
Sun Liren's Chinese New 38th Division for help. General Sun requested to lead his entire division to help the 1st Burma Division, but General
Luo Zhuoying, the commander of the Chinese Expeditionary Force in Burma, refused. On 17 April, General Sun led his 113th Regiment, which consisted of 1,121 men, 800 of whom were combat personnel, on the mission instead. Because the Chinese forces had no artillery or tanks, Lieutenant General Slim assigned the 7th Armoured Brigade, which was commanded by
Brigadier John Anstice, to General Sun. The brigade consisted of two regiments (battalions) of
M3 Stuart light tanks and a battery of
25-pounder guns. For the next three days, the Chinese forces attacked southwards. The temperatures reached and smoke from the demolished oil wells and refineries hung over the battlefield. Meanwhile, the 1st Burma Division fought its way to and across the Pin Chaung river, where they met with the relief column on 19 April. On the next day, the Chinese forces attacked southwards toward Yenangyaung and Pin Chaung. The attack caused the Japanese to suffer casualties, but the Allied forces could not keep the oil fields and had to retreat to the north. The retreat was covered by the newly-arrived 112th Regiment of the New 38th Division which engaged with Japanese forces until the following day when it joined its sister regiment in retreating from the battlefield. ==Results==