The river was at this time navigated entirely with sailing vessels, and large numbers of these were encountered by the "Clermont" during her up and down trips. The surprise and dismay excited among the crews of these vessels by the appearance of the steamer was extreme. These simple people, the majority of whom had heard nothing of Fulton's experiments, beheld what they supposed to be a huge monster, vomiting fire and smoke from its throat, lashing the water with its fins, and shaking the river with its roar, approaching rapidly in the very face of both wind and tide. Some threw themselves flat on the deck of their vessels, where they remained in an agony of terror until the monster had passed, while others took to their boats and made for the shore in dismay, leaving their vessels to drift helplessly down the stream. Nor was this terror confined to the sailors. The people dwelling along the shore crowded the banks to gaze upon the steamer as she passed by. A former resident of the neighborhood of Poughkeepsie thus describes the scene at that place, which will serve as a specimen of the conduct of the people along the entire river below Albany:
"It was in the early autumn of the year 1807 that a knot of villagers was gathered on a high bluff just opposite Poughkeepsie, on the west bank of the Hudson, attracted by the appearance of a strange, dark-looking craft, which was slowly making its way up the river. Some imagined it to be a sea-monster, while others did not hesitate to express their belief that it was a sign of the approaching judgment What seemed strange in the vessel was the substitution of lofty and straight black smoke-pipes, rising from the deck, instead of the gracefully tapered masts that commonly stood on the vessels navigating the stream, and, in place of the spars and rigging, the curious play of the working-beam and pistons, and the slow turning and splashing of the huge and naked paddle-wheels, met the astonished gaze. The dense clouds of smoke, as they rose wave upon wave, added still more to the wonderment of the rustics.
"This strange-looking craft was the 'Clermont,' on her trial trip to Albany; and of the little knot of villagers mentioned above, the writer, then a boy in his eighth year, with his parents, formed a part. I well remember the scene, one so well fitted to impress a lasting picture upon the mind of a child accustomed to watch the vessels that passed up and down the river.
"The forms of four persons were distinctly visible on the deck as she passed the bluff—one of whom, doubtless, was Robert Fulton, who had on board with him all the cherished hopes of years, the most precious cargo the wonderful boat could carry.
"On her return trip, the curiosity she excited was scarcely less intense. The whole country talked of nothing but the sea-monster, belching forth fire and smoke. The fishermen became terrified, and rowed homewards, and they saw nothing but destruction devastating their fishing-grounds; while the wreaths of black vapor, and rushing noise of the paddle-wheels, foaming with the stirred-up waters, produced great excitement among the boatmen, which continued without abatement, until the character of that curious boat, and the nature of the enterprise which she was pioneering, had been understood."
The alarm of the sailors and dwellers on the river shore disappeared as the character of the steamer became better known; but when it was found that the "Clermont" was to run regularly between New York and Albany, as a packet-boat, she became the object of the most intense hatred on the part of the boatmen on the river, who feared that she would entirely destroy their business. In many quarters Fulton and his invention were denounced as baneful to society, and frequent attempts were made by captains of sailing vessels to sink the "Clermont" by running into her. She was several times damaged in this way, and the hostility of the boatmen became so great that it was necessary for the Legislature of New York to pass a law declaring combinations to destroy her, or willful attempts to injure her, public offenses punishable by fine and imprisonment.
It had been supposed that Fulton's object was to produce a steamer capable of navigating the Mississippi River, and much surprise was occasioned by the announcement that the "Clermont" was to be permanently employed upon the Hudson. She continued to ply regularly between New York and Albany until the close of navigation for that season, always carrying a full complement of passengers, and more or less freight. During the winter she was overhauled and enlarged, and her speed improved. In the spring of 1808 she resumed her regular trips, and since then steam navigation on the Hudson has not ceased for a single day, except during the closing of the river by ice.
In 1811 and 1812, Fulton built two steam ferry-boats for the North River, and soon after added a third for the East River. These boats were the beginning of the magnificent steam ferry system which is to-day one of the chief wonders of New York. They were what are called twin-boats, each of them consisting of two complete hulls, united by a deck or bridge. They were sharp at both ends, and moved equally well with either end foremost, so that they could cross and re-cross without being turned around. These boats were given engines of sufficient power to enable them to overcome the force of strong ebb tides; and in order to facilitate their landing, Fulton contrived a species of floating dock, and a means of decreasing the shock caused by the striking of the boat against the dock. These boats could accommodate eight four-wheel carriages, twenty-nine horses, and four hundred passengers. Their average time across the North River, a mile and a half wide, was twenty minutes.
The introduction of the steamboat gave a powerful impetus to the internal commerce of the Union. It opened to navigation many important rivers (whose swift currents had closed them to sailing craft), and made rapid and easy communication between the most distant parts of the country practicable. The public soon began to appreciate this, and orders came in rapidly for steamboats for various parts of the country. Fulton executed these as fast as possible, and among the number several for boats for the Ohio and Mississippi Rivers.
Early in 1814, the city of New York was seriously menaced with an attack from the British fleet, and Fulton was called on by a committee of citizens to furnish a plan for a means of defending the harbor. He exhibited to the committee his plans for a vessel of war to be propelled by steam, capable of carrying a strong battery, with furnaces for red-hot shot, and which, he represented, would move at the rate of four miles an hour. These plans were also submitted to a number of naval officials, among whom were Commodore Decatur, Captain Jones, Captain Evans, Captain Biddle, Commodore Perry, Captain Warrington, and Captain Lewis, all of whom warmly united in urging the Government to undertake the construction of the proposed steamer. The citizens of New York offered, if the Government would employ and pay for her after she was built, to advance the sum ($320,000) necessary for her construction. The subject was vigorously pressed, and in March, 1814, Congress authorized the building of one or more floating batteries after the plan presented by Fulton. Her keel was laid on the 20th of June, 1814, and on the 31st of October, of the same year, she was launched, amid great rejoicings, from the ship-yard of Adam and Noah Brown. In May, 1815, her engines were put on board, and on the 4th of July of that year she made a trial trip to Sandy Hook and back, accomplishing the round trip—a distance of fifty-three miles—in eight hours and twenty minutes, under steam alone. Before this, however, peace had been proclaimed, and Fulton had gone to rest from his labors.