From Larry J. Woods and Colonel Timothy R. Reese, Military Interventions in Sierra Leone: Lessons From a Failed State (The Long War Series, Occasional Paper 28, CSI Press 2008) pp. 77-78 pdf:

On Friday, 25 August 2000, British Major Alan Marshall, stationed at Benguema Training Camp decided to make a visit to one of UNAMSIL’s battalions near the town of Masiaka, about 65-kilometers east of Freetown. Marshall and his men were part of the stay-behind British training contingent. Accompanying him on this visit was an SLA liaison officer and 11 soldiers from the Royal Irish Regiment. After visiting with Colonel Jehad al-Widyan, commander of the UNAMSIL battalion, he decided to take his patrol to the WSB base in nearby Magbeni. Marshall received an intelligence report that only a few rebels were present at the base and he wanted to check out the situation. His three Land Rovers were armed with .50-caliber heavy machine guns and the soldiers with SA80 rifles. As the patrol approached Magbeni, located 50 miles east of the capital in Freetown, the WSB blocked the road and denied them movement. Major Marshall tried to reason with them, but they insisted that he wait until their leader, 24-year old “Brigadier” Foday Kallay arrived.

As they waited, Major Marshall carried on a conversation with the boys and offered them cigarettes. Communication with the base at Benguema Training Camp was established via radio and the base camp was informed that the patrol was being detained. Once Kallay arrived, the situation turned tense. Kallay began issuing orders to his armed soldiers, became angry with Marshall for entering an unauthorized area without coordination, and surrounded the patrol with soldiers and a captured SLA truck mounted with a 14.5-mm heavy machine gun. As Marshall made attempts to reason with the WSB, he was physically beaten. Within 5 minutes, the rest of the Royal Irish soldiers were overwhelmed, disarmed, stripped, and taken by canoes upstream, across Rokel River, to Gberi Bana, Kallay’s headquarters.
and, when all was said and done, with rescue effected (p. 83 pdf):

British forces killed 25 and captured 18 WSB members.
What if the WSB in the initial encounter were treated as the armed combatants that they were ?

No statements are OTR.

Regards

Mike