Protected cruisers, a type of cruising warship of the late-19th century, gained their description because an armoured deck offered protection for vital machine-spaces from fragments caused by shells exploding above them. Protected cruisers resembled armored cruisers, which had in addition a belt of armour along the sides.

CSS Alabama, a screw sloop-of-war built in 1862 for the Confederate States Navy. The vessel was built in Birkenhead on the River Mersey opposite Liverpool, England, by John Laird Sons and Company. Launched as Enrica, she was fitted out as a cruiser and commissioned as CSS Alabama on August 24, 1862. Under Captain Raphael Semmes, Alabama served as a successful commerce raider, attacking, capturing, and burning Union merchant and naval ships in the North Atlantic, as well as intercepting American grain ships bound for Europe. The Alabama continued its wrath through the West Indies and further into the East Indies, destroying over seven ships before returning to Europe. On June 11, 1864, the Alabama arrived at Cherbourg, France, where she was overhauled. Shortly after. A Union sloop-of-war, USS Kearsarge, arrived; and on June 19, the Battle of Cherbourg commenced outside the port of Cherbourg, France, whereby the Kearsarge sank the Alabama in approximately one hour after the Alabama's opening shot.