With gifts and the grave consideration which instantly won Indians, La Salle moved from tribe to tribe towards the Gulf. Red River pulsed upon the course like a discharging artery. The sluggish alligator woke from the ooze and poked up his snout at the canoes. "He is," says a quaint old writer who made that journey afterwards, "the most frightful master-fish that can be seen. I saw one that was as large as half a hogshead. There are some, they say, as large as a hogshead and twelve to fifteen feet long. I have no doubt they would swallow up a man if they caught him." [Illustration: La Salle at the Mouth of the Mississippi.] In April La Salle reached his goal. He found that the Mississippi divided its current into three strands and entered the Gulf through three mouths. He separated his party; La Salle took the west passage, and Tonty and another lieutenant the middle and the east. At the Gulf of Mexico they came together again, and with solemn ceremonies claimed for France all the country along the great river's entire length, and far eastward and westward, calling it Louisiana, in honor of King Louis XIV. A metal plate, bearing the arms of France, the king's name, and the date of the discovery, was fixed on a pillar in the shifting soil. Hardy as he was, La Salle sometimes fell ill from the great exposures he endured. And more than once he was poisoned by some revengeful voyageur. It was not until the December following his discovery of the Mississippi's mouth that he realized his plan of fortifying the rock on the Illinois River. He and Tonty delighted in it, calling it Fort St. Louis of the Illinois. Storehouses and quarters for a garrison rose around its edges, protected by a palisade. A windlass was rigged to draw water from the river below. On the northeast corner of the rock a low earthwork remains to this day. Around this natural castle the Indian tribes gathered to La Salle, as to a sovereign,--Miamis, Abenakis, and Shawanoes, from countries eastward, and the Illinois returned to spread over their beloved meadow. Instead of one town, many towns of log, or rush, or bark lodges could be seen from the summit of the Rock. Years afterwards the French still spoke of this fortress as Le Rocher. A little principality of twenty thousand inhabitants, strong enough to repel any attack of the Iroquois, thus helped to guard it. La Salle meant to supply his people with goods and give them a market for their furs. At this time he could almost see the success of his mighty enterprise assured; he could reasonably count on strengthening his stockades along the Mississippi, and on building near its mouth a city which would protect the entire west and give an outlet to the undeveloped wealth of the continent. [Illustration: Louis XIV., King of France.]