With the Kingdom of England practically owned by Harold, Harthacnut could not even approach without securing sufficient military strength. His decision to remain in Denmark probably points to him lacking sufficient support, though he would certainly wait for an opportunity to forcefully assert his claim and depose his half-brother. Harold reigned as sole king from 1037 to 1040. There are few surviving documents about events of his reign. The "Anglo-Saxon Chronicle" mostly covers church matters, such as the deaths and appointments of bishops and archbishops. There is, however, record of a skirmish between the Anglo-Saxons and the Welsh in 1039. The named casualties were Eadwine (Edwin), brother to Leofric, Earl of Mercia, Thurkil, and Ælfgeat. But there are no other details concerning this event. Also in 1039, there is mention of a great gale, again with no details.