In Spring 1201 Sverre sailed out from Bergen with a large leidang force in what would be his last campaign season. With this army he could demand war taxes without opposition on both sides of the Oslofjord during the summer. In September he set up camp at Tønsberg and laid siege to Tønsberg Fortress, which was garrisoned by Reidar Sendemann and his men. The siege dragged on because the other Bagler leaders dared not send a relief force and the garrison did not fall for any of Sverre's tricks. At last, on 25 January, Reidar and his men surrendered, and Sverre decided to sail back to Bergen.