The GoS dry season offensive (or counteroffensive) in early 2002 caused the flight of civilians living on the Block 5A/Block 4 border, in Rupnyagai and Buoth near the Bahr El Ghazal (Nam) River. The government targeted Nuer civilians who lived along the road. A long-range artillery gun, placed in the gov garrison town of Wangkai, was able to reach Buoth and surrounding villages. This, coupled with the ground troops, forced people to flee south across the streams to Wicok, and then further south again to Chotchar.
Reference: HRW 2003: 295; Hiding Between the Streams, Nairobi, London, and Copenhagen, April 11, 2002, p 7