During the invasion of Dol Angra in the Second Northern War, after the capitulation of Rivia, the army of Lyria commanded by Queen Meve and the army of Aedirn commanded by King Demavend III faced the Nilfgaardian Army commanded by Menno Coehoorn, Elan Trahe, and Markus Braibant at the First Battle of Alderberg. The battle ended with a decisive defeat for Meve and Demavend's troops who were forced to retreat, leaving the city of Vengerberg, the capital of the Kingdom of Aedirn, without defense.
After being besieged for six days, Vengerberg was conquered by the Nilfgaardians, who slaughtered almost 6,000 people split between the civilian population and guards. Those who were able to survive the siege tried to escape towards the border with the Kingdom of Temeria, helped by reinforcements from the Aedirnian Special Forces commanded by Rayla. The Nilfgaardians, using Scoia'tael as vanguard, chased the fugitives in order to enslave them. Thanks to Rayla and her troops, a few citizens of Vengerberg managed to escape, although most of her unit was killed by Scoia'tael during the evacuation.