When Carl Johan Adlercreutz continued his summer offensive, he saw an excellent opportunity to encircle the Russian main army at the town of Nykarleby. The Swedish offensive began on Midsummer's Eve, but the Russian forces had already evacuated the city and pulled back to Vaasa, where another Swedish force, commanded by Johan Bergenstråhle were landing. The Swedes won a small victory at Nykarleby, but the ensuing festivities delayed the march to the south in such a manner that they couldn't support the Swedish landing force in Vaasa.