An Introduction to the "E" Class; part 1 - HMS Emerald

The introduction places the E class in a design sequence after the C and D classes, arguing that the D ships had unrealized upgrade potential while the E ships already embodied part of the next development.

The E class addressed surface raiders, while earlier C and D cruisers were built for fleet fighting and scouting.

The chronology weakens a simple German-cruiser origin story for the E class because much of the supposed threat was uncertain or incomplete when Britain made its decisions.

Emerald combined two Shakespeare-class destroyer machinery sets to deliver 80,000 horsepower, a 33-knot top speed, and an 8,000-nautical-mile economical range.

The unbuilt Euphrates prompts a counterfactual in which a British-friendly Irish Free State establishes a navy around an E-class cruiser.

On commissioning in 1926, Emerald joined the Fourth Cruiser Squadron in the Indian Ocean and remained in the East Indies until 1933.

The Royal Navy assembled cruisers, destroyers, a minelaying sloop, and gunboats from the China and East Indies stations as an immediately available force for Nanjing.

British, American, and Italian warships confronted violence at Nanjing with enough concentrated firepower to overmatch the forces ashore.

Emerald's East Indies posting balanced rapid access to China with the need to avoid making her part of the permanent deterrent facing Japan, the United States, and China.

Emerald's early-war command by VC winner Augustus Agar connects the cruiser to his earlier coastal-torpedo-boat raids against the Soviet fleet.

In October 1939 a battleship-and-cruiser force carried gold toward Canada while tropical uniforms and familiar East Indies ships made the movement resemble an imperial deployment.

Heavy seas stripped boats, depth charges, and Emerald's Seafox from the tropically prepared force, while crews reached Canada short of usable clothing.

Leander, Town, County, and E-class cruisers receive different assessments against a Deutschland-class raider, with Emerald's five single 6-inch guns judged the least convincing deterrent.

An attached R-class battleship supplied the decisive deterrent against a Deutschland-class raider because its 15-inch guns could overwhelm the smaller German ship.

Emerald carried a reported £58 million in gold in June 1940, and Enterprise transported another £10 million. The E-class cruisers were handling wartime finance as well as convoy escort.

Emerald returned to the Indian Ocean in 1941, served in the Persian Gulf and Iraq operations, and was made flagship of the Fast Group after Japan entered the war.

Photographs distinguish Emerald's two buff-and-white deployments through changes to the after turret, its lower ring, and the depth of the buff-painted superstructure.

Emerald's catapult aircraft progressed through the Flycatcher, Osprey, and Seafox before the cruiser received an American Kingfisher floatplane for 1941-43 service.

Emerald provided fire support on D-Day, but later lost priority as new ships needed crews and wartime recruiting favoured the army after the Battle of the Atlantic stabilised.