The Battle of Tertry occurred on August 3, 687, between the forces of Austrasia, led by Pepin of Herstal and his son Charles Martel, and the Neustrian army commanded by Berthar and Thierry III. The battle was a significant turning point in the Merovingian civil wars, resulting in a decisive victory for Austrasia and cementing its control over the entirety of Francia. Synonyms for the Battle of Tertry include the Battle of Tertry-sur-Somme and the Battle of Tertry-en-Vermandois, as it took place in the region that is now part of modern-day Somme and Aisne.