Lieutenant Zebulon Pike Jr. led a significant military expedition, authorized by President Thomas Jefferson, to explore the southern and western reaches of the Louisiana Purchase. This journey, spanning from July 15, 1806, to July 1, 1807, marked the first official American effort to map the western Great Plains and the Rocky Mountains in what is now Colorado. Pike's mission involved contacting Native American tribes to assert U.S. claims over their
territories and finding the headwaters of the Red River. The expedition ultimately led Pike and his men into Spanish territory, resulting in their capture and providing Pike with unexpected intelligence about Spanish colonial holdings.
The Journey Begins: From St. Louis to Pawnee Lands
The expedition commenced on July 15, 1806, when Lieutenant Zebulon Pike, then 27 years old, departed Fort Bellefontaine near St. Louis, Missouri. His detachment consisted of 20 soldiers and 50 Osage hostages, who were being returned to their people. The group followed the Missouri River and then the Osage River, reaching an Osage Nation village located near the present-day border of Kansas and Missouri. On August 15, Pike successfully returned the hostages and engaged in discussions with the native inhabitants, establishing initial contact as part of his mission.
Following their time with the Osage, Pike's expedition turned northwest, heading towards Pawnee territory situated on the Republican River in southern Nebraska. Pike spent several weeks at a Pawnee village, and on September 29, he met with the Pawnee tribal council. During this meeting, Pike formally announced the United States government's new claim of protectorship over the territory. He successfully persuaded the Pawnee chief to replace a Spanish flag flying in their village with an American flag, though he left them with the understanding that the American flag should not be hoisted during the Spaniards' potential return in force.
Across the Plains and Towards the Rockies
After leaving the Pawnee, the expeditionary force turned south, embarking on a journey across the prairie towards the Arkansas River. They reached the river on October 14, at which point the party divided. One group, led by Lieutenant James Biddle Wilkinson, the General's son, traveled downstream along the Arkansas to its mouth and then upstream along the Mississippi, eventually returning safely to St. Louis. Pike, however, led the larger contingent upstream, heading west towards the headwaters of the Arkansas River.
As Pike traversed the Great Plains, he recorded his observations, noting the vastness of the landscape. He wrote that these plains "may become in time as celebrated as the sandy deserts of Africa," describing tracts of many leagues where wind had sculpted sand into wave-like forms, devoid of vegetation. This description contributed to the perception of the area, with Stephen Long later labeling it the "Great American Desert" on his map in 1820, a term that influenced future settlement patterns.
Errors, Capture, and Unexpected Intelligence
Pike's company continued its westward push, making several navigational errors that ultimately led them into Spanish territory in present-day Southern Colorado. To survive the harsh winter conditions, the Americans constructed a fort. However, their presence did not go unnoticed. In February, Pike and his men were captured by Spanish authorities. They were subsequently taken into Mexico, beginning a journey that would provide Pike with invaluable, albeit unintended, intelligence.
Their travels through present-day New Mexico, Mexico, and Texas, while under Spanish escort, allowed Pike to gather significant data regarding Spanish military strength and civilian populations. Despite being prisoners, Pike and most of his men were eventually released because the United States and Spain were not at war. However, some of his soldiers were held in Mexican prisons for years, even after U.S. objections. Pike's account of his expeditions, published in 1810, became widely popular, translated into French, German, and Dutch for European audiences, solidifying his place in American exploration history, even with the controversial circumstances of his capture.
