The Muscovites promptly overran Lithuanian fortresses in Bryansk, Vyazma, Dorogobuzh, Toropets, and Putyvl. Local nobles, particularly the Vorotynskys, often joined the Muscovite cause. Another attack came from the southeast into Kiev Voivodeship, Volhynia, and Podolia. On July 14, 1500, the Lithuanians suffered a great defeat in the Battle of Vedrosha, and the Lithuanian Grand Hetman Konstanty Ostrogski was captured. The defeat was one of the reasons for the proposed Union of Mielnik between Poland and Lithuania. In November 1501, the Lithuanians were defeated again in the Battle of Mstislavl. The Crimean Tatars destroyed the Golden Horde, a Lithuanian ally, when its capital New Sarai was conquered in 1502.