Battle of Strėva, Strebe, or Strawe was fought on 2 February 1348 between the Teutonic Knights and pagan Grand Duchy of Lithuania on the banks of the Strėva River, a right tributary of the Neman River, near present-day Žiežmariai. Wigand of Marburg publicized this battle as a great victory for the Knights: he claims that some 18,000 Lithuanians were killed or drowned while only 8 knights and 60 other soldiers died on the Knights' side. Narimantas and Manvydas, two sons of Gediminas, Grand Duke of Lithuania, are thought to be killed in the battle. Because of the change in leadership (the Grand Master Heinrich Dusemer was troubled by poor health and died in 1353) and spreading Black Death, the Knights did not take full advantage of one of the biggest defeats of the Grand Duchy.