Consequently , in 879 the Viking army left Chippenham and made its way to Cirencester and remained there for a year .
Under the terms of the Treaty of Wedmore , the converted Guthrum was required to leave Wessex and return to East Anglia .
In 879 the Viking army left Chippenham and made its way to Cirencester and remained there for a year .
Under the terms of the Treaty of Wedmore , the converted Guthrum was required to leave Wessex and return to East Anglia .