Coordinates: 50°19′10″N 3°36′34″W / 50.31944°N 3.60944°W
The Battle of Blackpool Sands was the result of an attempted French raid on the port of Dartmouth, South Devon, England, in April or May 1404. Local forces defeated the raiders, taking a number of prisoners and killing the French commander, William du Chastel.
The early years of the 15th century were a period of extensive naval activity in the English Channel. In August 1403, William du Chastel led a raid on Plymouth which caused substantial damage. In October 1403, a fleet organised by John Hawley of Dartmouth and Thomas Norton of Bristol seized seven merchant vessels in the Channel and in November 1403, a revenge raid was launched on Brittany by Sir William Wilford, capturing 40 ships and causing considerable damage ashore. Despite the lateness of the season, the French under Count Waleran of St. Pol launched an attack on the Isle of Wight in December but were beaten off by local forces. The following spring, there were French raids on Portland and Weymouth.
In April or May 1404, William du Chastel assembled a fleet of 300 ships at St. Malo in Brittany. He embarked 2000 knights and men-at-arms, plus light infantry and crossbowmen. He had two vice-admirals, the Lords of Chateaubriand and de Jaille. Discipline, however, was poor and, on the first day after sailing, part of the fleet attacked some allied Spanish wineships. Although order was restored, parts of the fleet broke away, leaving du Chastel to sail on towards his target of Dartmouth with reduced forces. On arriving off Blackpool Sands, a wide beach approximately 3 miles southwest of Dartmouth near the village of Stoke Fleming, he dropped anchor and waited for six days to allow his fleet to reassemble.