Stenbock's forces turned west with 16,000 men to face the allies at Gadebusch, leaving 3,000 men to garrison Stralsund. Their victory and subsequent westward movement distracted the allies from the siege, yet when Stenbock burned down Danish Altona, Russian forces burned Swedish Pomeranian Wolgast east of Stralsund in revenge in 1713. The allies were free to concentrate on Stralsund again after Stenbock's forces, pursued by 36,000 Poles, Russians and Saxons, were defeated in the Battle of Tönning on 16 May 1713. Before re-joining with the siege army near Stralsund, Russian forces under Alexander Menshikov's command and a Saxon engineur corps were deployed from Tönning to Stettin, the second major Swedish fortress in Pomerania, and captured it on 29 September 1713. However, Russian tsar Peter the Great had to withdraw his forces from the Holy Roman Empire by the terms of the Treaty of Adrianople, concluded on 25 June 1713 as a consequence of the Pruth Campaign.