Amsterdam, June 10, 1864... The Kearsage, a northernist warship docks the docks to stop there... For weeks, this ship and its crew have been pursuing the Alabama, a formidable confederate corsair who, according to reports, already sank more than sixty northernist ships. Blutch and Chesterfield, after having explained their misadventures that led them to be present on the Kearsage, decide to visit and discover the city and its peculiarities, its mills, its merchants, when the Alabama is spotted. Captain Winslow, who has vowed to end the Alabama, launches the baton! Blutch and Chesterfield, despite them, are thus preparing to participate in one of the greatest naval battles of the Civil War.