THE BRITISH NAVY IN BATTLE, Arthur H. Pollen, London, 1919. MY MEMOIRS, Admiral van Tirpitz, 1919. LES ENSEIGNEMENTS MARITIMES DE LA GUERRE ANTI-GERMANIQUE, Admiral Daveluy, Paris, 1919. IL POTERE MARITTIMO NELLA GRANDE GUERRA, Captain Romeo Bernotti, Leghorn, 1920. There was only one action between the British Grand Fleet and the German High Seas Fleet in the World War, the battle of Jutland.
Daveluy, L'Esprit de la Guerre Navale, vol. i, p. 27, note. Military phraseology, from which the word is taken, employs "concentration" in three senses. It is used for assembling the units of an army after they have been mobilised.