The First Fleet was a formation of the Royal Navy that briefly existed before the First World War from 1912 to 1914.
The First Fleet was formed on 31 July 1912, with the Commander-in-Chief Home Fleets in direct command of it; a vice admiral commanded the Second and Third Fleets. The numbered fleets during this period had different levels of battle readiness; ships of the First Fleet ships were in full commission.
The First Fleet included four destroyer flotillas under Captain Cecil Lambert. Captain Reginald Tyrwhitt took over the command of the destroyer flotillas in December 1913.