F SMITH, Savannah, Tennessee. SIR: Last night I dispatched a party of cavalry, at 6 p.m., under the command of Lieutenant-Colonel Heath, Fifth Ohio Cavalry, for a strong reconnoissance, if possible, to be converted into an attack upon the Memphis road. The command got off punctually, followed at twelve o'clock at night by the First Brigade of my division, commanded by Colonel McDowell, the other brigades to follow in order.

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