A blockading navy must decide what neutral cargo is forbidden and how to deal with a ship carrying it. Available responses included impoundment, seizure, or purchase by the enforcing power. Personnel created a further problem when a navy relied on impressment and encountered sailors whose accents or origins made their nationality disputed. In the early nineteenth-century Atlantic, those judgments could place claimed American citizens in British service. Routine boarding practice therefore fed the neutral-rights tensions that helped produce the War of 1812.
Notable Point · 30:52-31:48
Contraband searches, cargo seizure, and impressment
Even when neutral ships are not attacked, boarding them to search for contraband, seize or buy cargo, and identify sailors can turn enforcement into a major diplomatic dispute.