The 41st Division was then ordered to hold east of Pantingan River in Pilar, Bataan and west of Mount Samat, along the Orion-Bagac Line, making them as the key unit to hold any southern movement of the Japanese forces through Trail 29. The 41st Division gave the stiffest opposition to the Japanese offensive, punishing elements of the opposing Japanese 65th Brigade's 141st Battalion. BGen. Lim at some point directed small and effective counter-offensives, only to be directed to return to the Bagac-Orion Line. The 141st Battalion by April 9 recorded that they have lost 70% of their manpower facing the 41st Division units. In exacting revenge after the Fall of Bataan, the 65th Brigade mistook the men of the 91st Division for the 41st Division, and had them summarily executed to now what is known as the Pantingan River massacre.