In August 1492, without declaring war, Ivan III began large military actions: he captured and burned Mtsensk, Lyubutsk, Serpeysk, and Meshchovsk; raided Mosalsk; and attacked the territory of the Dukes of Vyazma. Orthodox nobles began switching sides to Moscow as it promised better protection from military raids and an end to religious discrimination by Catholic Lithuanians. Ivan III officially declared war in 1493, but the conflict soon ended. Grand Duke of Lithuania Alexander Jagiellon sent a delegation to Moscow to negotiate a peace treaty. An "eternal" peace treaty was concluded on February 5, 1494. The agreement marked the first Lithuanian territorial losses to Moscow: the Principality of Vyazma and a sizable region in the upper reaches of the Oka River.