As soon as one power shall have adopted this terrible weapon, all others must accept it, under pain of evident inferiority, and thus combats will become combats of ram against ram." While forbearing the unconditional adhesion to the ram as the controlling weapon of the day, which the French navy has yielded, the above brief argument may well be taken as an instance of the way in which researches into the order of battle of the future should be worked out.

A French writer, commenting on Labrousse's paper, says:-- "Twenty-seven years were scarce enough for our fathers, counting from 1638, the date of building the 'Couronne,' to 1665, to pass from the tactical order of the line abreast, the order for galleys, to that of the line ahead.

We ourselves needed twenty-nine years from 1830, when the first steamship was brought into our fleet, to 1859, when the application of the principle of ram-fighting was affirmed by laying down the 'Solferino' and the 'Magenta' to work a revolution in the contrary direction; so true it is that truth is always slow in getting to the light....

This transformation was not sudden, not only because the new material required time to be built and armed, but above all, it is sad to say, because the necessary consequences of the new motive power escaped most minds."[24] We come now to the justly celebrated Four Days' Battle of June, 1666, which claims special notice, not only on account of the great number of ships engaged on either side, nor yet only for the extraordinary physical endurance of the men who kept up a hot naval action for so many successive days, but also because the commanders-in-chief on either side, Monk and De Ruyter, were the most distinguished seamen, or rather sea-commanders, brought forth by their respective countries in the seventeenth century.

Monk was possibly inferior to Blake in the annals of the English navy; but there is a general agreement that De Ruyter is the foremost figure, not only in the Dutch service, but among all the naval officers of that age.