The proposed HMS Agincourt could have become the world's first battleship armed with 18-inch guns. The exact battery remains uncertain: one reconstruction gives nine guns in three triple turrets, while the preferred interpretation here is six guns in three twin turrets. At about 28 knots, the ship could have served as John Jellicoe's flagship at Jutland. The counterfactual preserves the disagreement over the turret scheme instead of treating an incomplete design as settled.
Notable Point · 59:18-1:00:31
HMS Agincourt as a proposed 18-inch-gun battleship
A proposed 28-knot HMS Agincourt might have carried six or nine 18-inch guns and served as Jellicoe's flagship at Jutland.