sentences:  The heliborne troops were to link up with the 4th battalion of 5 Gorkha Rifles (Frontier Force) of 72 Brigade and the Sikh Light Infantry troops advancing on the ground.The operation ended in disaster as the LTTE, having intercepted IPKF radio transmissions, set up an ambush.The helidropped troops came under intense fire from LTTE positions, forcing the Mil Mi-8 helicopters to abandon the insertion midway through the operation.