In 5 ABY, he was the helmsman of the skimmer under Lt. Aagon who led Patrol 341. His gunner was Leeno. One of the speeder bike escorts was ridden by his best friend. The patrol deserted its area in order to have fun by hunting the native bouncer creatures, when his friend was shot by Rebels hiding behind the rocks. Aagon with some stormtroopers left the skimmer and ordered Forley to round the Rebels and pin them down, allowing his team to attack from behind. Forley intended to kill everyone to avenge his friend.
He rounded the rocks with the remaining bike and Leeno fired blindly against the rocks but with no avail. He ordered Leeno to concentrate on one rock until it exploded and hit some Rebels, forcing them out of their hiding place. After countless shots he could see no result, other than the remaining biker being killed. Kyle Katarn killed Aagon and Forley could not communicate to anyone for orders. He knew the skimmer was vulnerable but hesitated to run and then have to give explanations.
While Forley pondered his next move, Leeno, who manned the gun in front of him, noticed that something was behind and shouted. Forley turned and saw a white bouncer next to his face. He raised his hands which the creature's tentacles grasped, and his head was put in its mouth. Leeno in his panic swiveled the cannon around, shot at it, killing both Forley and the bouncer.
Aagon considered Forley a competent helmsman. However like all Imperial sergeants he were not trained in decision making, and after Aagon's death he was unable to make his next move.
Seeing his friend being killed by the Rebels he thought of retribution.