Pike Was Chosen To Trace The Mississippi

The Expeditions of Zebulon Montgomery Pike, Volume 1 (of 3) by Pike

I was chosen to trace the Mississippi to its source, with the objects in view contemplated by my instructions; to which I conceived my duty as a soldier should induce me to add an investigation into the views of the British traders in that quarter as to trade, and an inquiry into the limits of the  territories of the United States and Great Britain.

In the execution of this voyage I had no gentleman to aid me, and I literally performed the duties (as far as my limited abilities permitted) of astronomer, surveyor, commanding officer, clerk, spy, guide, and hunter; frequently preceding the party for miles in order to reconnoiter, and returning in the evening, hungry and fatigued, to sit down in the open air, by firelight, to copy the notes and plot the
courses of the day.