The Great Duchy of Moscow conquered Bryansk following the Battle of Vedrosha in 1503. The town was turned into a fortress which played a major role during the Time of Troubles of 1598–1613. Bryansk became the Moscow's south-western outpost in the fights against Lithuania, Poland and Crimean Khanate. In 1618 the Deulino Armistice saw the southern and western area of the Bryansk region temporarily ceded to Poland.