The Battle of Wopławki or Woplauken was fought on 7 April 1311 in the area near the village of Woplauken (Lithuanian - Voplaukis, now the Polish village of Wopławki), north-east of Kętrzyn (former Rastenburg). Belarusian historian Ruslan Gagua states in Annalistic Records on the Battle of Wopławki Archived 2020-06-26 at the Wayback Machine The battle definitely had become a major and significant one by medieval standards during the military confrontation of the Teutonic Order and the then Lithuania, according to The Nature of the Conduct of Warfare in Prussian and Lithuanian Borderlands at the Turn of the 13th and 14th Centuries by Ruslan Gagua.