In the autumn of 1633, Commonwealth forces retook Dorogobuzh, an important Russian supply point after its capture the year before. This setback wrecked Russian plans to send reinforcements to Shein's army, although in any event the Russians did not begin to gather a 5,000-strong army for that purpose until January 1634. Also that autumn, Grand Crown Hetman Stanisław Koniecpolski defeated an Ottoman incursion in the south of the Commonwealth, freeing his force to lay siege to the Russian town of Sevsk; although Koniecpolski failed to take the fortress, he tied down large Russian forces, preventing them from moving north towards Smolensk.