Atlantic Wars explores how warfare shaped human experience around the Atlantic from the late Middle Ages until the nineteenth century. Military concerns and initiatives drove the development of technologies like ships, port facilities, fortresses, and roads that made crossing the ocean possible and reshaped the landscape on widely separated coasts. Forced migrations made land available for colonisation, and the transportation of war captives provided labour in the colonies. Some wars spread to engulf widely scattered places, and even small-scale, localised conflicts had effects beyond the combat zone.