Fleury-sur-Orne (French pronunciation: [flœʁi syʁ ɔʁn] ⓘ, literally Fleury on Orne) is a commune in the Calvados department in the Normandy region in northwestern France.

During the First World War this name, meaning in French Germany, became inconvenient and embarrassing for the inhabitants (unlike those of Allemagne-en-Provence in Southern France).

Little is known about this battle, but it seems to have been a purely cavalry contest, with neither infantry nor archers playing a significant role.

Carried downstream en masse, the bodies of the massacred knights blocked the mill of Barbillon on the level of current Ile Enchantée.

The victory allowed William to remain Duke of Normandy, thus setting the stage for his later brilliant battles and statecraft.