Fergus grasped the pieces of his own rifle and dived to the ground. 'No!' he shouted, rolling away through the mud. 'Not the boats! Stay away from the boats! Stay low, stay low!'

But it was already too late. Bullets thudded into the wet earth as the young Colombians hurtled towards the river, their weapons forgotten and abandoned. The youngest boy, Nino, stood rigid, petrified like a rabbit in car headlights, his eyes wide with fear.

The camp was surrounded: ground troops were approaching from all sides and shouted orders were drowned out by the sound of automatic gunfire. The attack had been expertly planned, and Fergus felt a moment of professional admiration as he mechanically loaded his AK.

He grabbed the terrified boy and dragged him towards the forest escape route. Before they had moved more than a few paces Fergus heard a stifled cry, felt Nino jerk away and turned to see him falling into the leaf litter. Blood oozed from his head.

Fergus was hit before he could return fire. The bullet smashed into his thigh and sent him spinning away, face down in the mud. Searing pain burned through his body. He lifted his head and saw blood-red bone protruding from the gaping wound in his leg.

The thudding sound of heavy machine-gun fire drifted back from the river. Fergus knew that the guerrillas who had made it to the boats would have been picked off by the helicopter gunships and that, by now, their bodies would be floating downstream.

And then it was all over. The firing stopped as quickly as it had begun. Fergus tried to crawl towards the undergrowth as he heard more shouted commands and then men running towards him. He was grabbed by the shoulders and turned over. Four Colombian soldiers stared down at him, their camouflaged faces glistening with sweat as they jabbed their rifle barrels into his face and excitedly shouted to their commander. 'Gringo! Gringo!'