A stride this point on which was located the vital North-South Trail 4, was positioned the 23D Infantry Regiment which held the center of the 21st Division (PA), subjected to artillery and serial bombardment in the morning of Good Friday, 3 April, its outpost line of resistance North of Tiawir River collapsed.  At 1500 hours the Japanese 61st Infantry Regiment, 4th Division broke through the main line of resistance at this point and swerving eastward for the 22D Infantry to abandon its position.  By nighttime the Japanese has pushed 1,000 yards behind the main line of resistance on their advance toward Limay.  On the 6th of April, the Japanese had overwhelmed all resistance offered by the 23rd and 22d Infantry Regiments resulting in the disintegration of the 11 Corps and the Surrender of Bataan.