The Russian fleet, under command of Admiral Vasily Chichagov, blockaded the Swedish fleets with their 30,000 men in Viborg Bay. The blockade continued for a month and on 21–23 June, with supplies running out, the Swedes chose to attempt a breakout as soon as favorable winds would allow it. The Swedish coastal squadron under Lieutenant-Colonel Carl Olof Cronstedt arrived at Svensksund on 19 June and supported the ground forces of General Meijerfeldt in driving away Russian forces from its vicinity. However, Cronstedt's squadron could not get past a Russian frigate detachment under Captain Rowan Crown (orig. Robert Cronin) blocking the coastal sea route near modern-day Virolahti and had to return to Svensksund. The Swedish escape from the Viborg Bay started on 3 July and lost several ships when they ran aground due to bad visibility in the treacherous waters. The Swedish battle fleet retired to Sveaborg for repairs while the Swedish coastal fleet made for a strong defensive position at Svensksund. The Russian coastal fleet, led by Charles Henry of Nassau-Siegen started its attack against the Swedes on 9 July 1790, in what became known as the second battle of Svensksund, which ended in a decisive Swedish victory.