American treaty cruisers were fast and well provisioned for long searches, yet their powerful eight-inch batteries initially had very limited protection. The Pensacola and Northampton classes risked taking serious damage when a search turned into a fight with enemy scouts. At sea, where terrain cannot conceal a large ship, the first defence was to find the enemy before being seen. The second was enough protection to survive the first hit and disengage. The Portland and New Orleans classes improved that survivability, with New Orleans carrying a belt between three and five inches thick and a somewhat thicker armoured deck. New Orleans's nine guns in three triple turrets also simplified maintenance and weight distribution compared with Pensacola's ten guns in four mixed turrets.
Notable Point · 58:14-1:02:37
American scouting cruisers face the reconnaissance fight
Fast American treaty cruisers must both gather information and defeat enemy scouts, exposing the limits of lightly protected early designs.