The Battle of Conquereuil was fought on June 27, 992 AD between the Bretons under Conan I, Duke of Brittany[a] and the Angevins under Fulk the Black.
Conan raised the siege and began marching his troops back in the direction of Rennes to face Fulk.
Once Conan realized that his army could not outrun Fulk, Conan halted at Conquereuil and prepared the battlefield, digging pits and ditches which were flooded by the water of nearby swamps and then hidden by covering them lightly with sod, and behind this prepared earthworks which had their flanks secured by the swamps.
Fulk reorganized his army, attacked the Bretons again, and routed them, killing Conan in the process.
Another version of the story suggests that the Breton counterattack was successful and drove the Angevins back in disarray.