Warwick and the Duke of Clarence travelled to France where Clarence was married to Warwick's fifteen year old daughter Isabel. The ceremony was conducted by Warwick's brother George Neville the Archbishop of York.

After their treachery had been uncovered, the Earl of Warwick and Duke of Clarence fled to France. Warwick's plan was to get help from the French King. They took a ship with their immediate relatives and followers from either Exeter or Dartmouth. Isabella, Warwick's daughter, gave birth on the ship to a son, but he died shortly afterwards. When they reached Calais, the deputy-governor, John Lord Wenlock, refused them entry to the harbour and fired his guns at them. ^[1]

Isabel, the wife of George, Duke of Clarence died a few months after giving birth to her second child. Clarence chose Mary of Burgundy as his next wife. Mary was the heir to the Duchy of Burgundy and had a good claim to the English throne. Edward saw the danger of his brother marrying Mary and claiming the throne and prevented the marriage going ahead. ^[2]