The battleship that first armed against the threat from above

Wars & Conflicts · Published 16 October 2026 Swipe more like this →

In short: Before the era of carrier-based aviation, the Royal Navy had to innovate to defend against a new predator: the airship. The Iron Duke-class battleships became the first British capital ships to mount anti-aircraft weaponry, marking a pivotal shift in naval defense as the world moved toward a three-dimensional battlefield.

Launched between 1912 and 1913, the Iron Duke-class was the third generation of British 'super-dreadnoughts.' While they were largely refinements of the King George V-class—retaining ten 13.5-inch guns in five twin turrets—they featured significant upgrades in armor and secondary armament. Notably, they replaced 4-inch guns with more powerful 6-inch weapons to counter modern torpedo boats, a design choice that added roughly 2,000 long tons to their displacement, bringing them to 25,000 long tons.

The class faced immediate technical hurdles. The 6-inch guns were mounted in hull casemates that were initially too low, causing them to take heavy pounding in rough seas. Furthermore, the hinged plates intended to seal these openings were often washed away, leading to severe flooding. These issues required the later addition of dwarf bulkheads and rubber seals. Despite these flaws, the ships were the most advanced in the Royal Navy at the start of World War I, serving as the backbone of the Grand Fleet.

The class's legacy is defined by its role in the Battle of Jutland in 1916. Iron Duke served as the flagship for Admiral John Jellicoe, while Marlborough endured a massive 21-meter torpedo hit that forced her to withdraw. After the war, the ships were largely phased out by the 1930 London Naval Treaty. Iron Duke survived the longest, serving as a training and depot ship until 1946, even surviving Luftwaffe near-misses in 1939 before finally being scrapped.

A unique historical footnote is the class's first foray into anti-aircraft defense. In 1914, Iron Duke was fitted with two 3-inch QF guns specifically to defend against German airships. These manually operated weapons fired high-explosive shells to a maximum ceiling of 23,500 feet, representing the dawn of the era where naval power had to account for threats from the sky.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The battleship designed to be economical became a naval workhorse
• The last British pre-dreadnoughts were obsolete before they even entered the Royal Navy's service.
• The British battleship designed to survive the end of treaties
• The treaty-bound battleship that survived the hunt for the Bismarck
• One British ship in 1906 made every battleship afloat obsolete
• Italy's brutal internal conflict: when compatriots fought for the nation's soul during World War II
• The Irgun: A Zionist Paramilitary Force That Challenged British Rule and Official Leadership
• Mussolini's opportunistic gamble: Why Italy invaded a collapsing France in June 1940
• How a post-war standoff in Iran became the first test of Cold War containment
• The Italo-Turkish War introduced aerial combat and set the stage for global conflict.
• The only royal palace on U.S. soil tells a story of eviction
• From Marine Corps Lieutenant General to the U.S. House: The Career of Jack Bergman

More in World wars era · More in Wars & Conflicts · Latest · A–Z · All topics