English fleets in the thirteenth and fourteenth centuries typically comprised specialist vessels, such as galleys and large transport ships, and pressed merchant vessels conscripted into action; the latter increasingly included cogs, a new form of sailing ship. Battles might be fought when one fleet found another at anchor, such as the English victory at Sluys in 1340, or in more open waters, as off the coast of Winchelsea in 1350; raiding campaigns, such as the French attacks on the south of England between 1338–39, could cause devastation from which some towns never fully recovered.