 Instead, a UFM commander defected with a significant stock of weaponry to the NRA, further weakening the UFM.Fighting in the West Nile region occasionally spilled over into Sudan as UNLA troops pursued rebels over the border.This first occurred in April 1982, when UNLA troops crossed the frontier near Nimule and opened fire on a Sudanese Army unit; the Sudanese troops subsequently detained about 20 Ugandan soldiers.