The Navy In The Civil War
The Gulf And Inland Waters

Mississippi Valley -- Cairo To Memphis.

At the 37th parallel of north latitude the Ohio, which drains the northeast portion of the Valley of the Mississippi, enters that river. At the point of junction three powerful States meet. Illinois, here bounded on either side by the great river and its tributary, lies on the north; on the east it is separated by the Ohio from Kentucky, on the west by the Mississippi from Missouri. Of the three Illinois was devoted to the cause of the Union, but the allegiance of the two others, both slave-holding, was very doubtful at the time of the outbreak of hostilities.

The general course of the Mississippi here being south, while that of the Ohio is southwest, the southern part of Illinois projects like a wedge between the two other States. At the extreme point of the wedge, where the rivers meet, is a low point of land, subject, in its unprotected state, to frequent overflows by the rising of the waters. On this point, protected by dikes or levees, is built the town of Cairo, which from its position became, during the war, the naval arsenal and depot of the Union flotilla operating in the Mississippi Valley.

From Cairo to the mouths of the Mississippi is a distance of ten hundred and ninety-seven miles by the stream. So devious, however, is the course of the latter that the two points are only four hundred and eighty miles apart in a due