Clarke has been on a few long patrols down in Alsace. Recently they had a short distance patrol from Fontaine airfield that went across the frontlines due east. No enemy planes sighted, Clarke was preparing to head back to Fontaine when he heard a steam locomotive. Geoffrey his rear gunner also heard the train and tapped his shoulder and pointed down while grinning wildly. Clarke signal to other two planes that he was leaving formation and dropped down alongside the enemy train.
They weren't far from the frontlines and this train was heading deeper into enemy territory. Might be one of those smuggler's trains he had heard about, didn't matter really as it was about to become target practice for Geoffrey.
They didn't damage the train enough to stop it, but Geoffrey sure did enjoy the three passes Clarke made along side the enemy train.