To La Salle the commission was full of promise, for his ardent mind was filled with bold designs. He foresaw a time when French enterprise, leaving the rugged civilisation on the banks of the St. Lawrence, would seize upon the rich valley of the Mississippi; a fortified post at the mouth of the Father of Waters would hold the interior of the continent against the Spaniards; and the peltries and buffalo hides of the great West would fill his forts with gold. With Henri de Tonty, La Motte de Lussière, Father Hennepin, and thirty men, La Salle hastened to Quebec in the summer of 1678, and without loss of time he organised his first expedition to the distant Mississippi.

The story of that enterprise is a tale of disaster which has few parallels in history. A perilous passage over Lake Ontario in a ten-ton vessel brought them to Niagara. Above the falls they built The Griffin, a schooner of forty-five tons, to carry the necessities of the Mississippi settlement westward by way of the Great Lakes. This vessel was lost by some obscure calamity, and the conjecture is that she foundered in Lake Michigan. La Salle now found himself at the head of a mutinous company stranded at Fort Crèvecœur on the Illinois, facing a winter with practically no provisions. Six of his men deserted, and on two occasions treachery all but deprived him of his life.

In the circumstances La Salle saw only one possible course before him: to return to Fort Frontenac for fresh supplies and material for further progress. Leaving Tonty his trusted lieutenant in charge of Fort Crèvecœur, he set out with an Indian guide and four Frenchmen. The hardships and disasters of the journey deprived him of his companions, one by one, but he pressed on alone. "During sixty-five days he had toiled almost incessantly, travelling about a thousand miles through a country beset with every form of peril and obstruction.... In him an unconquerable mind held at its service a frame of iron, and taxed it to its utmost endurance. The pioneer of Western pioneers was no rude son of toil, but a man of thought, trained amid arts and letters." [13]

This first chapter of his reverses, however, was not yet completed; for even while La Salle was getting succour for his company on the Illinois, a letter arrived from Tonty telling him of the mutiny of the garrison and the wilful destruction of Fort Crèvecœur with all it held. The calamitous news would have killed the spirit of any one less courageous than La Salle; but the bold explorer, whose whole life was a long grapple with adversity, prepared with all haste to return to the rescue of Tonty, who, he hoped forlornly, had survived the mutinous treachery. By the 10th of August he was ready, and with a new outfit and twenty-five men he set out once more for the distant Illinois.

After three months of toil and hardship he came again to Fort Crèvecœur. Anxiety for Tonty and his faithful companions had consumed him all the way. Yet he was unprepared for the shocking sight that met his eyes. The once populous town of the Illinois was now a valley of dry bones; the bodies of women and children strewed the plain, and the charred trophies of Illinois warriors hung tragically upon blackened stakes. Such were the terrible marks of an Iroquois visitation.

Wolves ran howling away as the Frenchmen drew near, and voracious buzzards wheeled overhead. Anxiously La Salle sought among the revolting remnants for any sign of Tonty; but none was to be found, and although the relief expedition continued for weeks and months to search for their missing comrades, it was spring before the explorer heard with joy that his lieutenant had found refuge among the Pottawattamies. Meanwhile, his resources for the Mississippi expedition had been again dissipated, and once more he returned to Fort Frontenac for fresh supplies.

Soon, for the third time, the persistent adventurer set his face towards the west. His company now included twenty-three Frenchmen and eighteen Indians, equipped with all the care his former experiences could suggest. Summer had gone before his plans were completed; but all seasons were alike to La Salle, and in the early autumn his expedition began. Lake Huron was reached in October, Fort Miami a few weeks later, and on the 6th of February their canoes glided out of the Illinois into the eddying current of the Mississippi.

Down past the turbid Missouri they swept, and beyond the mouth of the Ohio. Every day brought them newer signs of spring, and every day saw the spirits of La Salle rising at the happy consciousness of fulfilled ambition. On the 13th of March they encamped near the mouth of the Arkansas, and three hundred miles below they were well received by the Natchez Indians. On the 6th of April the great river divided before them into three wide channels: La Salle followed that of the west; Tonty took the middle course; and D'Autray descended the eastern passage. On the 19th of April the three parties met on the Gulf of Mexico. A cross bearing the arms of France was set up, and the country was named Louisiana after the Grand Monarch.

The Louisiana of to-day conveys no idea of the vast tract of country defined by La Salle's proclamation of 1682. To the explorer it meant the extent of the mighty continent, stretching westward from the Alleghanies to the Rockies, and north and south from Lake Superior to the Gulf of Mexico. All former accessions of territory were small beside it, and to his eyes it seemed the fertile Canaan of French enterprise. Yet the very magnitude of this new success made for the undoing of New France, by scattering her feeble forces over the length and breadth of a continent and distending her line of defence so far that it could be easily pierced. La Salle, however, was driven irresistibly forward by the hot ambition which ruled him. His romantic vision pictured a greater New France in the valley of the Mississippi, governed by himself—a prosperous trading colony shipping cargoes of beaver-skins directly to Europe by way of the Gulf of Mexico. Quebec, however, was the home of his enemies. His former reverses had shattered the faith of creditors, while the Canadian merchants envied him the monopoly of the Western trade. They heaped calumny upon his enterprises, labelled him a coureur de bois, and persistently wrecked his schemes. Final success enabled La Salle in a measure to disregard these annoyances; but when the new Governor, La Barre, went the length of seizing Fort Frontenac—thus cutting off the far west from its supplies—and even declared him an outlaw, La Salle, although he had but lately recovered from a fever, made up his mind to carry his cause to France.

In the spring of 1684, therefore, the weatherbeaten woodsman of the New World stood before the throne of the Grand Monarch; and although the Court had greater terrors for him than the Canadian forests, yet he was able to set forth the rights of his case with the honest boldness of a frontiersman and the force of a cultured intellect. Louis followed his words with deepest interest, and was moved to carry out a purpose which for some time had possessed his mind. Within three months four armed vessels, bearing nearly four hundred men, set sail from Rochelle for the Gulf of Mexico. A new commission empowered the explorer to establish a fort on the southern gulf, from which to harass the Spaniards, and to fortify a base near the mouth of the Mississippi for the effective control of Louisiana.