The Parliamentarians attacked but were eventually driven back and the Royalists took up defensive positions among ancient earthworks on the moor. Reinforcements of infantry came from Okehampton and Chudleigh and continued to threaten the Royalists, but as skirmishing continued into the night, a violent rain storm broke over the battlefield with added to the confusion and terror.
Grenvile played a key part in a stand amongst the Royalist guns that saved the Cornish army from destruction but eventually the Royalists were routed and left behind their weapons, stores and gunpowder. Hopton's portmanteau was also captured. It contained letters from the King ordering the Cornish army to join forces with the Earl of Hertford and Prince Maurice in Somerset.