The naval treaty that forced engineers to choose between speed and armor

Countries & Cities · Published 13 October 2026 Swipe more like this →

In short: During the 1920s, international naval treaties forced engineers to navigate strict weight limits. To comply, British designers had to make difficult trade-offs between speed, armament, and protection. The resulting County-class cruisers became iconic examples of how diplomatic agreements can dictate the physical architecture and engineering compromises of military technology.

The County-class cruisers were born from the Washington Naval Treaty of 1922, which capped ships at 10,000 tons of standard displacement and 8-inch guns. Because the term 'heavy cruiser' wasn't officially defined until 1930, these were the first 'post-war' cruisers built under international restrictions. Designers like Charles Lillicrap had to balance three competing needs: speed, armament, and protection. While the United States opted for shorter hulls and triple-gun turrets to save weight for armor, the Royal Navy required long hulls to maintain the cruising range and independent fighting power needed for colonial trade route defense.

To maximize efficiency, the Navy initially planned for 8,250-ton 'B' ships, which would have allowed for more vessels in the fleet. However, politics and economics intervened, and only two 'B' ships—the York class—were ever built. The thirteen surviving Counties were divided into three sub-classes: Kent, London, and Norfolk. They were characterized by a distinctive three-funnel layout and a conservative design featuring a long, flush-decked hull. While the three-funnel look was handsome, it was actually a somewhat impractical use of internal space.

The limitations of the treaty led to some 'ridiculous' engineering decisions. For instance, the 8-inch guns were designed to elevate to 70 degrees for anti-aircraft fire, even though the ships lacked the fire control systems or speed to actually track aerial targets. Later modernizations often pushed these ships over their treaty limits. For example, the Kent class reached a standard displacement of about 10,600 tons. One ship, HMS London, suffered severe structural cracking during a 1938–1941 refit because the added weight of new superstructures and armor overstressed the original hull design.

Despite these design struggles, the class saw extensive service across nearly every theater of World War II. They were involved in the pursuit of the battleship Bismarck and fought actions against German and Japanese forces. While three ships—Canberra, Cornwall, and Dorsetshire—were lost during the war, the class remains a primary example of how international diplomacy can dictate the physical architecture of military technology.

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