 In 1227, the Livonian Brothers of the Sword, the town of Riga, and the Bishop of Riga organized a combined attack against Saaremaa.After destruction of Muhu Stronghold and surrender of Valjala Stronghold, the Oeselians formally accepted Christianity.After the defeat of the Livonian Brothers of the Sword in the Battle of Saule in 1236 fighting again broke out on Saaremaa.