When General Pope began to move against New Madrid, MO, the army was expanded with units from neighboring military districts.
He then commanded the so-called "Flotilla Brigade" of the Army of the Mississippi during the Battle of Island Number Ten.
===Left Wing (Army of the Mississippi)===
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Originally called the Army Corps of Central Kentucky, it was created in the fall of 1861 as a subsection of Department No. 2, and continued in existence until the end of March 1862 when it was absorbed and merged into the Army of the Mississippi, which was then re-organized as the Army of Tennessee on November 20, 1862.
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On March 29, 1862, the army at about 23,000 men strong was merged into the Army of the Mississippi in preparation for the Battle of Shiloh.