Without the French war-ships the French could not have landed and supported their troops, who, under Rochambeau, were also under Washington, and gave him the assistance that he wofully needed, to achieve by arms our independence.
The War of 1812 is instructive from the fact that, though the actions of our naval ships produced little material effect, the skill, daring, and success with which they were fought convinced Europeans of the high character and consequent noble destiny of the American people.

The British were so superior in sea strength, however, that they were able to send their fleet across the ocean and land a force on the shores of Chesapeake Bay.

This force marched to Washington, attacked the city, and burned the Capitol and other public buildings, with little inconvenience to itself.
The War of the Rebellion is instructive because it shows how two earnest peoples, each believing themselves right, can be forced, by the very sincerity of their convictions, to wage war against each other; and because it shows how unpreparedness for war, with its accompanying ignorance of the best way in which to wage it, causes undue duration of a war and therefore needless suffering.
If the North had not closed its eyes so resolutely to the fact of the coming struggle, it would have noted beforehand that the main weakness of the Confederacy lay in its dependence on revenue from cotton and its inability to provide a navy that could prevent a blockade of its coasts; and the North would have early instituted a blockade so tight that the Confederacy would have been forced to yield much sooner than it did.

The North would have made naval operations the main effort, instead of the auxiliary effort; and would have substituted for much of the protracted and bloody warfare of the land the quickly decisive and comparatively merciful warfare of the sea.
In the Spanish War the friction between the United States and Spain was altogether about Cuba.

No serious thought of the invasion of either country was entertained, no invasion was attempted, and the only land engagements were some minor engagements in Cuba and the Philippines.