The Battle of Murowana Oszmianka of May 13–May 14, 1944 was the largest clash between the Polish resistance movement organization Home Army (Armia Krajowa, AK) and the Lithuanian Territorial Defense Force (Lietuvos vietinė rinktinė, LVR); 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 Reichskommissariat Ostland (modern Muravanaya Ashmyanka, Belarus, former Murowana Oszmianka, Second Polish Republic). The outcome of the battle was that the 301st LVR battalion was routed and the entire force was disbanded by the Germans soon afterwards.