In the Spring of 1549 the new prayer book led to protests across Cornwall under Humphrey Arundell.
Citizens of Stamford rebelled against their church. A member of the gentry was killed. The force then marched to Credition. The government sent a small force under Sir Peter to deal with the rebels but they made it worse and burnt the town down by accident.
Arundell decided to capture Exeter. Those citizens most supportive of the rebels had left the city reducing the pressure. John Blackaller with a fear of treason overcame the sympathies with the rebels.