Retreating from the French invasion, John took a safe route around the marshy area of The Wash to avoid the rebel held area of East Anglia. His slow baggage train (including the Crown Jewels), took a direct route across it and was lost to the incoming tide. This dealt John a terrible blow, which affected his health and state of mind. Succumbing to dysentery and moving from place to place, he died at Newark Castle. He was buried at Worcester Cathedral, in the West Midlands.