sentences:  In summer of 1262 Treniota and Shvarn attacked Masovia, killing Duke Siemowit I, and raided Culmerland, provoking Pogesanians to join the uprising.However, assassination of Mindaugas and subsequent dynastic fights prevented Lithuanians from further campaigns.Skalmantas, leader of Sudovians, raided Culm (Chełmno) in 1263 and in 1265.