Durig the Civil WarCornwall was a devoted county of England, entirely loyal to King Charles I and Royalists cause. However Devon was Parliamentarian, as such this forced the River Tamar into the site of many battles. Each side of the Tamar understood that if they were to either invade or defend themselves they had to have control of the Tamar's crossings. Gunnislake New Bridge was one of four bridges crossing the River Tamar.[1]
The Robert Devereux, 3rd Earl of Essex, force of roundheads pushed into Cornwall over the bridge. They were met with great defence from Grenviles forces, quartered at the garrisons of Cotehele House and Harewood House, Calstock. The bridge was hard fought for however the Roundheads failed to advance into Cornwall. The battle lasted only for a day. It culminated in 240 casalties, many royalist were taken prisoner.[2][3][4]
After the stalemate at New Bridge the forces continued to defend either side of the bridge. Lord Essex's force traveled north to Launceston, leaving half of his force defending New Bridge. Lord Essex then regrouped with his other force based to the northern half of the Tamar Valley. On the 26th of July Lord Essex was victorious at a bridge on the River Tamar this allowed him and his forces to penetrate the Royalist defences and to continue into the heart of Cornwall. This was culminated in the Battle of Lostwithiel, resulting in a disastrous defeat for the Parliamentarian force.
Royalists
Parliamentarians
Sir Richard Grenville .png){kind=small}
Thomas Southcott
Earl of Essex 
William Balfour
