 After rejoining the earlier Lemdha resistance fighters, Pachen aided in dividing the refugees into smaller, less visible groups, organized and dispatched defensive patrols, and actively engaged in armed warfare.During this migration, her group was aided by CIA paramilitary support.Their camp was attacked by overwhelming Chinese forces in the area around the Pelbar village in Tingri County in late 1959, shortly after they heard of Chushi Gangdruk's defeat.