Key and the Siege Engine in the Castle Record

Key looks across an empty field: a distant wooden form faces castle walls. It is an evocation, not a reconstruction.

World History Encyclopedia’s Catapult disambiguation page points to medieval European siege warfare; its short excerpt says sieges became especially important as castles spread from the eleventh century. That gives this scene a historical setting, not the dimensions or workings of a particular engine, and not evidence for any specific battle. The distance in the image is deliberate.