After Matilda's withdrawal, London was taken over by the forces of another Matilda, Stephen's queen who stood firm with her husband. Coming back onside was the Kings brother, Henry of Blois, Bishop of Winchester who had previously supported Matilda's cause, after the events in London, however, Henry had switched sides making his way to the City of Winchester.
Angered at Henry's abandonment of her cause Matilda's forces made their way towards Hampshire, arriving at Winchester's city walls on the 31st July 1141 taking everyone by surprise.
Henry soon took to his horse and fled the city, his army too, causing much destruction as they left.
Henry of Blois defense of Winchester against Matilda is seen as one of the turning points of the civil war. She managed to flee, but her key ally Robert of Gloucester was captured.