Although Sweyn had promised to leave England, he returned in spring 1070, raiding along the Humber and East Anglia toward the Isle of Ely, where he joined up with Hereward the Wake, a local thegn.
Selvom Svend havde lovet at forlade England, så vendte han tilbage i foråret 1070 og plyndrede langs Humber og East Anglia mod Isle of Ely, hvor han slog sig sammen med Hereward the Wake, en lokal thegn.