Majestic-class gun donors and British fleet depth

Hannibal, Magnificent, Victorious, and Mars were laid up in early 1915 so their 12-inch guns could arm new monitors. The decision answered an immediate Western Front need for heavy artillery while making use of an Abercrombie-derived monitor hull already available to the Admiralty. Removing the weapons did not end every donor ship's service. Hannibal, Magnificent, and Mars served as troopships during the Dardanelles campaign. Hannibal later became a depot ship in Egypt, while Mars returned to Britain as an ammunition and depot ship. Britain could redistribute guns, crews, and hulls across several roles instead of treating the old battleships as a single package. That capacity gave the Royal Navy reserve depth for a long war, in contrast with Germany's impressive paper strength and thinner supporting inventory.