The service between the bases and the mobile force between the ports and the fleets is mutual.[112] In this respect the navy is essentially a light corps; it keeps open the communications between its own ports, it obstructs those of the enemy; but it sweeps the sea for the service of the land, it controls the desert that man may live and thrive on the habitable globe.
FOOTNOTES: [93] That is, with the guns on board, but for the most part not mounted on their carriages, in order to give increased accommodation for troops.

When the troops were landed, the guns were mounted.
[94] Ramatuelle: Tactique Navale.
[95] Lapeyrouse-Bonfils: Hist.

de la Marine.
[96] Clerk: Naval Tactics.
[97] Jurien de la Graviere: Guerres Maritimes.
[98] Mahon: History of England.
[99] Mahon: History of England.
[100] For these, see Troude: Batailles Navales.
[101] See Plate VIII.
[102] Troude: Batailles Navales de la France.
[103] Lapeyrouse-Bonfils.
[104] Mahon: History of England.
[105] Campbell: Lives of the Admirals.
[106] Mahon: History of England.
[107] Martin: History of France.
[108] Martin: History of France.
[109] Campbell: Lives of the Admirals.
[110] See Annual Register, 1762, p.

63 [111] Campbell: Lives of the Admirals.
[112] These remarks, always true, are doubly so now since the introduction of steam.

The renewal of coal is a want more frequent, more urgent, more peremptory, than any known to the sailing-ship.