Frederick II of Prussia ordered a force of 3,800 commanded by Major-General Paul von Werner to disengage from the battles in Silesia and instead relieve Kolberg, which was some to the North. After a 13-day ride, Werner's force arrived at the Russian lines on 18 September and attacked immediately. A successful skirmish made the besiegers believe they were dealing with a force of up to 20,000 and led them to withdraw on board of their vessels. The Swedish and Russian ships left on 20 and 23 September, respectively. Russian casualties amounted to 600 troops.