But the success was more than compensated by the opportunity which his absence gave to the Earl of breaking the line of the Severn.
Taken by surprise and isolated as he was, Simon had been forced to seek for aid and troops in an avowed alliance with Llewelyn, and it was with Welsh reinforcements that he turned to the east.

But the seizure of his ships and of the bridges of the Severn held him a prisoner in Edward's grasp, and a fierce attack drove him back, with broken and starving forces, into the Welsh hills.

In utter despair he struck northward to Hereford; but the absence of Edward now enabled him on the 2nd of August to throw his troops in boats across the Severn below Worcester.

The news drew Edward quickly back in a fruitless counter-march to the river, for the Earl had already reached Evesham by a long night march on the morning of the 4th, while his son, relieved in turn by Edward's counter-march, had pushed in the same night to the little town of Alcester.

The two armies were now but some ten miles apart, and their junction seemed secured.