The Russian attack against Barösund started on 18 September. The attacking force consisted of 4 ships of the line, 1 frigate and 6 cutters. Fighting continued for two hours and cost the Swedes a single galley and the Russians one ship of the line ("Severny Oryol") and several others damaged, but it gained the Russians the control of the Barösund strait. Sporadic fighting in the archipelago near Porkala continued and on 23 September the Russians captured the island of Älgsjön from the Swedes, but lost it on 30 September when Swedish reinforcements under Colonel Gustaf Mauritz Armfelt arrived. The Russian fleet left the area suddenly on 23 October, possibly due to the news that the Swedish open sea fleet had set sail, which it had done on 13 October, only to return to Karlskrona on 22 October. The Russian departure opened the safe coastal sea route to Swedish transports. In 1790, King Gustav revived the plan for a landing close to Saint Petersburg, this time near Viborg. In addition, a determined effort was made to bolster the strength of the fleets as much as possible so as to be able to get them under sail as soon as possible. The coastal fleet especially was being reinforced with new and stronger ships, some of them donated by the various Swedish towns. The first action took place on 17 March 1790, when two Swedish frigates plundered the Russian-controlled port of Rågersvik (Russian: "Baltiyskiy Port"). Swedish squadrons from Stockholm started towards Sveaborg on 21 April and also from Pommern on 3 May. Even though the Swedish main effort was on the sea, they attacked also on land, where Swedes led by Colonel Gustaf Mauritz Armfelt defeated Russian defenders on 15 April in southern Savolax, while the army led by King Gustav III and Colonel Gustav Wachtmeister won another victory in the battle of Valkeala. A Russian attack on 5 May close to the Kymmene river gained some success, capturing Anjala, but was thrown back before the end of the month. Fighting on land, however, reached stalemate, and already in June had turned into static warfare. The Swedish open sea fleet under Duke Charles arrived on 10 May at Hangö and moved on 12 May to the vicinity of Reval. As some ships of the fleet were still separated from the main body, Duke Charles refused to carry out the attack on 12 May, when favourable winds still existed, and instead chose to attack on 13 May, leading to the Swedish failure at the battle of Reval.