In the spring of 1805 Burr set out for the West. He took coach for the journey over the mountains to Pittsburgh, where he had arranged by letter to meet General James Wilkinson, the governor of the new territory of Louisiana. Wilkinson was delayed, however, and so Burr embarked in an ark that he had ordered built to sail down the Ohio River. After several days on the water he reached Blennerhassett Island early in May. The owner of the island was away from home, but his wife invited Burr to their house, and he learned from her that her husband was looking for a way to mend his fortunes.
Next day Burr continued his journey in the ark. He reached Cincinnati, then a very small town of fifteen hundred people, where he talked over his plans with several friends. From Cincinnati he went to Louisville, and from there rode to Frankfort. At Nashville he was the guest of Andrew Jackson, who was major-general of the Tennessee militia. Word spread about that Aaron Burr was plotting to free Florida and the West Indies from Spanish rule, and the liberty-loving settlers welcomed him with open arms.
Leaving Andrew Jackson, Burr floated in an open boat to the mouth of the Cumberland River, where his ark, which had come down the Ohio, was waiting for him. The ark made its first stop at a frontier post called Fort Massac, and there Burr met General Wilkinson of Louisiana. These two men were real soldiers of fortune. They had fought side by side at the walls of Quebec, and Wilkinson, like many another, had fallen under the spell of Burr's charm. They probably discussed the whole situation: how a small army might seize Florida, how a small navy could drive the Spaniards from Cuba, how a daring band of frontiersmen could march from Vera Cruz to the city of Mexico. Wilkinson seemed delighted with Burr's schemes, and when he left he provided his friend with a large barge manned by ten soldiers and a sergeant.
In this imposing vessel Burr sailed on down the Mississippi to New Orleans, and on June 25, 1805, landed at that quaint old city. It was already a place of much importance; seagoing ships and thousands of river flatboats docked at its levees, for it was the chief port for sending goods to Mexico and the other Spanish colonies. Burr brought letters to many prominent people, and a public dinner was given in his honor. The visitor had been Vice-President of the United States, and was said to be the leader of a band of mysterious patriots. Enthusiasm ran high in New Orleans when their guest said, as he had already announced in Tennessee, that he intended to devote his life to overthrowing all Spanish rule in America.
Day after day the soldier of fortune was busy with his plans. When he started north on horseback he carried with him the fame of a great patriot. Wherever he stopped, at cabins, at villages, or cities, the frontiersmen wanted to shake his hand. He rode four hundred and fifty miles through the wilderness from Natchez to Nashville, where he again visited Andrew Jackson, who promised him Tennessee soldiers for a war on Spain. At St. Louis he learned that General Zebulon Pike was exploring the best route over the plains to Santa Fé, and many letters told him that the time was ripe to settle old grudges with the borderers of Mexico. Everything seemed favorable to his adventure. Burr had only to decide where he would strike first. He was back in the East by the middle of November, 1805, having filled the whole country with rumors of wild plots and insurrections. He was a figure of mystery. People whispered that Aaron Burr was to be the Washington of a new republic in the West, or the king of a country to be carved out of Mexico.
By the summer of 1806 Burr knew that he could not get money from England to further his plans. He would have to depend on his own countrymen in any attack on Mexico or Spain. His journey had showed him that many of them were eager to follow his lead. Troubles were daily increasing along the borders of Florida and Mexico. It looked easy to take an army into Florida, but there would be more profit in the rich country to the southwest. His friend, General Wilkinson, had just been sent to drive the Mexicans across the Sabine River, the western boundary of Louisiana, and Burr thought this was a good chance to go west again, and perhaps call the settlers to arms. Men he trusted started west early in the summer of 1806, and Burr, with his daughter, and a Colonel De Pestre, who had fought in the French Revolution, and a few friends and servants, set out in August for their meeting-place on Blennerhassett Island. When he arrived there he was warmly welcomed by the owner. Burr showed Blennerhassett how he could make his fortune in Mexico, because if the conspiracy were successful they could take a large part of that country for themselves. Fired by Burr's story the men on the island immediately began preparations. They sent to the town of Marietta for one hundred barrels of pork, and contracted to have fifteen boats delivered at the island the following December. A kiln was built near Blennerhassett's house for drying corn, which was then ground into meal, and packed for shipping. All sorts of provisions were purchased, and the Blennerhassett family prepared to send their household goods down the river. Word of the plans spread, and men in various towns near the Ohio made ready to join the expedition. When the leader should send out his messengers recruits would come pouring in.
In the meantime Burr himself had left the little island and covered a wide stretch of country. He wanted to be sure of Andrew Jackson's aid, and he found that fiery warrior as ready as ever to fight Spaniard or Mexican in the cause of liberty. The general still thought that his friend Burr's only object was to free all of North America. Eager in that cause, Jackson sent word to the Tennessee militia, urging them to be ready for instant duty against the Spaniards, who, he said, had already captured several citizens of the United States, had cut down our flag, had driven our explorers away from the Red River, and had taken an insulting position on the east bank of the River Sabine, in the territory of Orleans. He wrote to President Jefferson offering to lead his Tennessee militia against the troops of Spain. A large part of the country expected war at once. Burr, for his own purposes, did all he could to inflame this warlike feeling.
In October the chief conspirator met his daughter, Theodosia Alston, her husband, and Blennerhassett at Lexington, Kentucky. He now arranged to buy a tract, known as the Bastrop lands, which included nearly a million acres in northern Louisiana on the Washita River. This purchase he meant to use as a blind, intending to settle there only in case his other plans failed. If the United States Government should suspect the conspirators of plotting against Mexico, they could pretend to be merely settlers, armed to defend themselves in case the Spaniards should overrun their borders. The tract would be valuable in any case, because of the rich bottom-lands and vast forests, and made a splendid base for a raid into the Spanish provinces.
Recruits were added daily to Burr's forces. He told them as much or as little of his schemes as he thought advisable. To some he said that he was a secret agent of the government, to others that he only meant to start a new pioneer settlement. If there should be war with Spain the men who followed him would share in the spoils, if victorious. If there was no war they would be ready to protect the border against invaders.
There were some people, however, who could not get over their distrust of Burr because of what he had done. The mysterious preparations at Blennerhassett Island caused some uneasiness in the neighborhood, and on October 6th a mass meeting of the people of Wood County, Virginia, was held, and the military preparations on the island were denounced. Blennerhassett was away at the time, but his wife, hearing of the meeting, grew uneasy, and sent her gardener, Peter Taylor, to tell her husband this news. Taylor found the conspirators at Lexington, and gave them Mrs. Blennerhassett's message. The gardener was evidently taken into his master's confidence, because he said later that the plan was "to take Mexico, one of the finest and richest places in the whole world." He added, "Colonel Burr would be the King of Mexico, and Mrs. Alston, daughter of Colonel Burr, was to be Queen of Mexico, whenever Colonel Burr died.... Colonel Burr had made fortunes for many in his time, but none for himself; but now he was going to make something for himself. He said that he had a great many friends in the Spanish territory; no less than two thousand Roman Catholic priests were engaged, and all their friends would join, if once he could get to them; that the Spaniards, like the French, had got dissatisfied with their government, and wanted to swap it."