William Walworth group conspired to keep food prices up, lent money to the king at inflated interest, and through personal and financial influence persuaded the king to issue edicts profitable to themselves. His most famous exploit was his encounter with Wat Tyler during the English peasants' revolt of 1381, in his second term of office as Lord Mayor. In June of that year, when Tyler and his followers entered south London, Walworth defended London Bridge against them. He was with Richard II when he met the insurgents at Smithfield, and killed the rebel leader with his baselard. The circumstances of the killing
Peasants' Revolt encountered Lady Joan, the King's mother, who was travelling back to the capital to avoid being caught up in the revolt; she was mocked but otherwise left unharmed. The Kentish rebels reached Blackheath, just south-east of the capital, on 12 June. Word of the revolt reached the King at Windsor Castle on the night of 10 June. He travelled by boat down the River Thames to London the next day, taking up residence in the powerful fortress of the Tower of London for safety, where he was joined by his mother, Archbishop Sudbury, the Lord High Treasurer Sir Robert Hales,