With that control, New England would have been restored to close and safe communication with New York, New Jersey, and Pennsylvania; and this blow, following so closely on Burgoyne's disaster of the year before, would probably have led the English to make an earlier peace.

The Mississippi is a mighty source of wealth and strength to the United States; but the feeble defences of its mouth and the number of its subsidiary streams penetrating the country made it a weakness and source of disaster to the Southern Confederacy.
And lastly, in 1814, the occupation of the Chesapeake and the destruction of Washington gave a sharp lesson of the dangers incurred through the noblest water-ways, if their approaches be undefended; a lesson recent enough to be easily recalled, but which, from the present appearance of the coast defences, seems to be yet more easily forgotten.

Nor should it be thought that conditions have changed; circumstances and details of offence and defence have been modified, in these days as before, but the great conditions remain the same.
Before and during the great Napoleonic wars, France had no port for ships-of-the-line east of Brest.

How great the advantage to England, which in the same stretch has two great arsenals, at Plymouth and at Portsmouth, besides other harbors of refuge and supply.

This defect of conformation has since been remedied by the works at Cherbourg.
Besides the contour of the coast, involving easy access to the sea, there are other physical conditions which lead people to the sea or turn them from it.