is to act where it can, either directly or indirectly, command the land. It operates with most effect against low and exposed coasts. St. Jean d'Acre affords, perhaps, the best example of a town at the mercy of a fleet. Portsmouth, Sydney, Brest, and Toulon cannot be held by an enemy unless he brings forces sufficient to hold the neighbouring heights. In occupying Toulon, the Sea Power was virtually putting its head into the lion's jaw. Only by degrees did the authorities at home understand this all-important fact. For some time it was veiled from Pitt; and, as we shall see, the Austrian Chancellor, Thugut, never did understand it. To those who were on the spot, the need of occupying the promontory behind l'Eguilette was apparent; and on 21st September Lord Mulgrave and Rear-Admiral Gravina led a force to seize the very height on which Bonaparte's will had already fastened. The Allies crowned it with a temporary work dignified by the name of Fort Mulgrave. The fortunes of Toulon turned on the possession of all the heights commanding the harbour, but especially of this one.
