The Siege of Kaunas was laid by the Teutonic Order on the newly built Kaunas Castle in spring 1362. It was the first brick castle built by the Grand Duchy of Lithuania. After a month-long siege, the castle was captured and destroyed. Its commander Vaidotas, son of Kęstutis, and 36 others were taken captive. The defeat, followed by the destruction of Veliuona and Pieštvė the following year, severely weakened Lithuanian defenses along the Neman River and opened central Lithuania to Teutonic attacks.