Battleship
Doctrine

Battleships were the embodiment of sea power. For American naval officer Alfred Thayer Mahan and his followers, a strong navy was vital to the success of a nation, and control of the seas was vital for the projection of force on land and overseas. Mahan's theory, proposed in The Influence of Sea Power Upon History, 1660–1783 of 1890, dictated the role of the battleship was to sweep the enemy from the seas. While the work of escorting, blockading, and raiding might be done by cruisers or smaller vessels, the presence of the battleship was a potential threat to any convoy escorted by any vessels other than capital ships. This concept of "potential threat" can be further generalized to the mere existence (as opposed to presence) of a powerful fleet tying the opposing fleet down. This concept came to be known as a " fleet in being "—an idle yet mighty fleet forcing others to spend time, resource and effort to actively guard against it.

Mahan went on to say victory could only be achieved by engagements between battleships, which came to be known as the decisive battle doctrine in some navies, while targeting merchant ships (commerce raiding or guerre de course, as posited by the Jeune École) could never succeed.

Mahan was highly influential in naval and political circles throughout the age of the battleship, calling for a large fleet of the most powerful battleships possible. Mahan's work developed in the late 1880s, and by the end of the 1890s it had acquired much international influence on naval strategy; in the end, it was adopted by many major navies (notably the British, American, German, and Japanese). The strength of Mahanian opinion was important in the development of the battleships arms races, and equally important in the agreement of the Powers to limit battleship numbers in the interwar era.

The "fleet in being" suggested battleships could simply by their existence tie down superior enemy resources. This in turn was believed to be able to tip the balance of a conflict even without a battle. This suggested even for inferior naval powers a battleship fleet could have important strategic effect.
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