Battle of Bourgthéroulde

[2] Although the battle is considered to be a minor skirmish between two small bands of soldiers, it had a profound impact on the stability of the region during a time when the ownership of the duchy was in question.

In response to the raids, Odo Borleng, castellan of Bernay, gathered knights of Henry's household known as the Familia Regis,[4] and raised a force from the local garrisons.

[1][5] Other notable members of Odo's party were William of Tancarville, the king's chamberlain, and Ralph of Bayeux, the castellan of Evreux.

[2] Waleran's force was making its way from the rebellion's main headquarters at the castle of Beaumont-le-Roger to raid when their path was blocked by Odo's army on March 26.

[5] Some primary sources of the battle also claim that the English had horse archers that were used to flank the enemy; however, this was extremely rare in western Europe at the time and is considered unlikely.

[4] Presumably, the mounted cavalry that were held in reserve were immediately tasked with chasing down any fleeing enemies and were able to capture them, including Waleran himself.

Waleran was treated well relative to his former allies and was imprisoned first at Rouen, then at Bridgnorth in Shropshire and finally at Wallingford Castle, before being released in 1129.