The Grand Fleet was the main Fleet of the British Royal Navy during the First World War.
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After America entered the war, US Battleship Division Nine was attached to the Grand Fleet as the Sixth Battle Squadron, adding four, and later five, dreadnought battleships.
The actual strength of the Fleet varied through the war as new ships were built and others were sunk, but the numbers steadily increased as the war progressed and the margin of superiority over the German Fleet progressed with it.
The Grand Fleet was the main Fleet of the British Royal Navy during the First World War