Answer:
1, The Pike Expedition (July 15, 1806 – July 1, 1807) was a military party sent out by President Thomas Jefferson and authorized by the United States government to explore the south and west of the recent Louisiana Purchase.[1] Roughly contemporaneous with the Lewis and Clark Expedition, it was led by United States Army Lieutenant Zebulon Pike, Jr. who was promoted to captain during the trip. It was the first official American effort to explore the western Great Plains and the Rocky Mountains in present-day Colorado. Pike contacted several Native American tribes during his travels and informed them that the US now claimed their territory. The expedition documented the United States' discovery of Tava which was later renamed Pikes Peak in honor of Pike. After splitting up his men, Pike led the larger contingent to find the headwaters of the Red River. A smaller group returned safely to the US Army fort in St. Louis, Missouri before winter set in.
Pike's company made several errors and ended up in Spanish territory in present-day Southern Colorado, where the Americans built a fort to survive the winter. Captured by the Spanish and taken into Mexico in February, their travels through present-day New Mexico, Mexico, and Texas provided Pike with important data about Spanish military strength and civilian populations. Although he and most of his men were released because the nations were not at war, some of his soldiers were held in Mexican prisons for years, despite US objections. In 1810, Pike published an account of his expeditions, which was so popular that it was translated into French, German, and Dutch for publication in Europe.
2, Pike and his escort entered New Mexico a few miles west of the Rio Grande and on February 28th arrived at Ojo Caliente, a small village on the frontier, on March 1, 1807.
3, On February 26, in the night Pike and his remaining men were captured at their fort by Spanish soldiers from nearby Santa Fe. Arresting the party as spies, the Spanish collected the rest of his men who had been scattered in the mountains, and marched them all south.
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