Original sentence: In 1227, Saaremaa was conquered by the Livonian Brothers of the Sword during the Livonian Crusade but the resistance of the local inhabitants remained strong.In the XIVth book of Gesta Danorum, Saxo Grammaticus describes a battle on Öland in 1170 in which the Danish king Valdemar I mobilised his entire fleet to curb the incursions of pirates from Couronia and Saaremaa.Nordic Iron Age ship burials, dated to AD 700-750, have been found in Sõrve Peninsula.Perhaps the most renowned raid by the inhabitants of Saaremaa occurred in 1187, with the attack on the Swedish town of Sigtuna (other candidates as raiders are Karelians and Curonians).Saaremaa was  and the home of notorious pirates, sometimes called the Eastern Vikings.The Chronicle of Henry of Livonia describes a fleet of sixteen ships and five hundred pirates from Saaremaa ravaging the area that is now southern Sweden, then belonging to Denmark
Edited sentence: In 1206, King Valdemar II of Denmark built a fortress on the island but found no volunteers to man it.In 1227, Saaremaa was conquered by the Livonian Brothers of the Sword during the Livonian Crusade but remained a hotbed of Estonian resistance.In the XIVth book of Gesta Danorum, Saxo Grammaticus describes a battle on Öland in 1170 in which the Danish king Valdemar I mobilised his entire fleet to curb the incursions of Couronian and Estonian pirates.Perhaps the most renowned raid by the inhabitants of Estonia occurred in 1187, with the attack on the Swedish town of Sigtuna (other candidates as raiders are Karelians and Curonians).Pre-Viking age Salme ship burials have been found in Sõrve Peninsula.Saaremaa was the wealthiest county of ancient Estonia and the home of notorious Estonian pirates, sometimes called the Eastern Vikings.The Chronicle of Henry of Livonia describes a fleet of sixteen ships and five hundred "Estonian pirates" ravaging the area that is now southern Sweden, then belonging to Denmark.The Danes burned it themselves and left