The Wars of Foundation were a series of feuds between Vinland and the Native Eriksons. Most "battles" were actually nationalists from each settlement attacking and killing people from the town on the other side.
Most historians consider the Wars of Federation as a series of skirmishes, as opposed to a full out war. The only battle that was fought like a modern war was the Battle of Kysten Byen.
The Battle of Kysten Byen was fought entirely in Vinland on April 16, 1017. It killed 17 Vinlanders and 22 Natives. The pamphlet Første Krigen i Vinland (First War in Vinland) was written directly after the battle by a colonist named MalikSørensen. It explained the history of the war and why the Natives attacked them over a faulty trade. The book is assigned to many Vinlandic children to read, because it details the history of the settlement and the establishment of Vinland.
The attacks stopped after the Vinlanders managed to kill the clan leader of the Natives, and the Natives surrendered. The Vinlanders reveled in their win, but still had lost half of their population during the battles.
February 7 (day of the end of the war) is celebrated as a national holiday in Vinland, and is called Første seier Day (First Win Day).