The Battles of Lostwithiel or Lostwithiel Campaign, took place near Lostwithiel and Fowey during the First English Civil War in 1644. After defeating the Army of Sir William Waller at the Battle of Cropredy Bridge, King Charles marched west in pursuit of the Parliamentarian army of the Earl of Essex, who was invading the Royalist stronghold of Cornwall. This setback for Parliament in Cornwall, and the last major victory for the Royalists, was reversed by Sir Thomas Fairfax leading the New Model Army at or near Tresillian Bridge, close to Truro on 12 March 1645.