Further Danish forces had settled on the land before Guthrum attacked Wessex: in East Anglia, and in Mercia between the treaty at Exeter and the attack on Chippenham; many others were lost in a storm off Swanage in 876-7, with 120 ships wrecked.
Outras forzas danesas asentáronse na zona antes de que Guthrum atacase Wessex: en Anglia Oriental, e en Mercia entre o tratado de Exeter e o ataque a Chippenham; outros moitos perdéronse nunha tormenta fronte á costa de Swanage, en Dorset, no 876-7, onde naufragaron 120 barcos.