[1] As a result of winning the battle, William was able to retain his title and maintain control over the western half of his duchy.

[3] The historian David Douglas argues for a date early in 1047 on the ground that the drowning of the fleeing army indicates that the Orne was flooded, which points to the winter or spring.

Despite an energetic siege, William was not able to force the castle into surrender until 1050, and, during that time, he was not able to assert his authority in the eastern third of his duchy, which lay beyond Brionne.

After the Battle of Val-ès-Dunes, there was still strong opposition to William among the Norman nobles, but they were forced to declare a "Truce of God" at Caen in October 1047.

[5] This truce, backed by the full endorsement of the Church, stated that private wars or vendettas were prohibited from Wednesday evening to Monday morning.