Since to a great manufacturing nation, like ours, the greatest danger from outside (except actual invasion) would seem to be the sudden stoppage of her oversea trade by blockade, we seem warranted in concluding that, since the only possible means of preventing a blockade is a navy, the primary use for our navy is to prevent blockade.

This does not mean that a fleet’s place is on its own coast, because a blockade might be better prevented by having the fleet elsewhere; in fact it is quite certain that its place is not on the coast as a rule, but at whatever point is the best with relation to the enemy’s fleet, until the enemy’s fleet is destroyed.  In fact, since the defensive and the offensive are so inseparably connected that it is hard sometimes to tell where one begins and the other ends, the best position for our fleet might be on the enemy’s coast.  It may be objected that the coast of the United States is so long that it would be impossible to blockade it.  Perhaps, but that is not necessary:  it would suffice to blockade Boston, Newport, New York, the Delaware, the Chesapeake, and the Gulf, say with forty ships.  And we must remember that blockade running would be much more difficult now than in the Civil War, because of the increased power and accuracy of modern gunnery and the advent of the search-light, wireless telegraph, and aeroplane.

It may also be objected that the blockading of even a defenseless coast would cost the blockading country a good deal of money, by reason of the loss of trade with that country.  True; but war is always expensive, and the blockade would be very much more expensive to the blockaded country; and though it might hold out a long while, it would be compelled to yield in the end, not only because of the blockade itself but because of the pressure of neutral countries; and the longer it held out, the greater the indemnity it would have to pay.  The expense of blockading would therefore be merely a profitable investment.

The author is aware that actual invasion of a country from the sea would be a greater disaster than blockade, and that defense against invasion has often been urged in Great Britain as a reason for a great navy; so that the primary reason for a navy might be said to be defense against invasion.  But why should an enemy take the trouble to invade us?  Blockade is easier and cheaper, and can accomplish almost everything that an enemy desires, especially if it be enlivened by the occasional dropping of thousand-pound shells into Wall Street and the navy-yard.

While, however, the primary use of naval power seems to be to prevent blockade, a navy, like any other weapon, may be put to any other uses which circumstances indicate.  For instance, the Northerners in the Civil War used the navy not to prevent blockade, but to make blockade; the Japanese used the navy to cover the transportation of their armies to Manchuria and Corea; and Great Britain has always used her navy to protect her trade routes.