I want to know the answer to the following question:
John sent William Longespee to retake what?
All the background I'm provided with is that "Having regained the south-east John split his forces, sending William Longespée to retake the north side of London and East Anglia, whilst John himself headed north via Nottingham to attack the estates of the northern barons.". Is that enough to answer the question?
Answer: yes