Steam, Steel and Dreadnoughts 1806 - 1918 With the exception of the surprising setbacks inflicted by America's fledgling navy during the War of 1812, the 19th century was a time of unchallenged mastery for the Royal Navy. Nevertheless, technical innovations developed at an unprecedented rate and forever changed the face of the navy. Muzzle-loading cannon fired in broadsides were replaced by powerful breech-loaders mounted in revolving armoured turrets. Mighty Wooden Walls were shattered and replaced by iron and steel as sail gave way to steam power.