The Battle of Murowana Oszmianka of 13–14 May 1944 was the largest clash between the Polish resistance movement organization Home Army (Armia Krajowa, AK) and the Lithuanian Territorial Defense Force (LTDF); a Lithuanian volunteer security force subordinated to Nazi Germany occupational administration. The battle took place in and near the village of Murowana Oszmianka in Generalbezirk Litauen, part of the Reichskommissariat Ostland. The outcome of the battle was that the 301st LTDF battalion was routed and the entire force was disbanded by the Germans soon afterwards due to its members refusing to take an oath to Hitler and be subordinate to German commanders.