CHAPTER XIV. UP THE TENNESSEE AND AT PITTSBURG LANDING. At St.Louis .-- Progress of our Arms in the Great Valley .-- Cairo .-- Its Peculiarities and Attractions .-- Its Commercial, Geographical, and Sanitary Advantages .-- Up the Tennessee .-- Movements Preliminary to the Great Battle .-- The Rebels and their Plans .-- Postponement of the Attack .-- Disadvantages of our Position .-- The Beginning of the Battle .-- Results of the First Day .-- Re-enforcements .-- Disputes between Officers of our two Armies .-- Beauregard's Watering-place..