The 65th Infantry and the attached Philippine 10th Battalion Combat Team occupied the right half of the line, with the Filipinos on the outside flank along Route 33 and the 2nd and 3rd Battalions facing northwest and west along the Imjin. In regimental reserve, the 1st Battalion was located along Route 33 just above the Hant’an River. The British 29th Brigade with the Belgian Battalion attached held the remainder of the division's line. The 29th Infantry Brigade consisted of three British and the Belgian Battalion supported by tanks and artillery. Despite facing a numerically superior enemy, the brigade held its positions for three days, repelling several human wave attacks and inflicting more than 10,000 casualties in the process. After being encircled, however, the 1st Battalion Gloucestershire Regiment, nicknamed the 'Glosters', was nearly destroyed and those surviving were captured. In the course of the battle, the brigade suffered 1,091 casualties, including 622 of the Glosters. This was considered by the PVA as one of their spectacular feats of arms during the war, although their casualties were nearly ten times that of their adversaries. The loss of the regiment caused much controversy in Britain and within the UN Command. Hwacheon (22–24 April) With the collapse of the ROK 6th Division a penetration was created and the US 1st Marine Division was in serious jeopardy. At 21:30 the duty officer at the 1st Marine Division command post was informed that the PVA had penetrated ROK defenses and were headed toward Marine lines. Not long after the message arrived the vanguard of a long line of demoralized ROK soldiers began filing in. By 22:24, the impact of the disaster on the left was apparent, so all plans to resume the Operation Dauntless attack the next day were abruptly canceled. The 1st Marine Division and attached 1st Korean Marine Corps Regiment came under attack from the PVA 120th Division at 02:00 on 23 April and with help from supporting arms successfully defended their positions until the morning when they were ordered to retreat to the Pendleton Line at 09:35 on 23 April to avoid being surrounded. The Marines successfully withdrew under fire towards the Pukhan River and Chuncheon. The PVA attacked the new Marine positions on the night of 23-24 April but were repulsed. Withdrawal to the Kansas Line (22–23 April) Considering the forward I Corps' and IX Corps' positions untenable, opened to envelopment as