From Jackson, Miss.
--The Jackson correspondent of the Mobile Register writes under date of May 7th, as follows:‘ General Pemberton is represented to express the fullest confidence in his ability to check Grant and capture the detachments which have been sent inland in order to turn the town of Vicksburg. The only thing which gives him any uneasiness is the raids on the railroads diverging into the State of Mississippi from Corinth and Grand Junction.
Jackson may be visited at any time by a raid of cavalry from the neighborhood of Edwards' Depot, a few miles this side of Big Black river; but the bluebells hardly contemplate the permanent occupation of the place. Every precautionary measure has been taken to secure. Government property and private effects, and breastworks and rifle pits are being constructed wherever needed.--The people are determined to resist to the last, and with the military force now here there is no doubt but that we can successfully hold our own. The President has taken measures to provide arms and equipments for all the men the Governor may raise throughout the State, and everything goes to show that the determination of the Mississippians to defeat their soil is cheerful, enthusiastic and universal. Three hundred citizens of Brandon are drilling every day — the same is the case, relatively to their population, at Caution, Meridian, and other towns; but it would be imprudent to state how many in Jackson have shouldered their muskets. Suffice it that hardly any one is backward at the call of Gov. Petius.
If the worst should come, and our troops in the field back of Vicksburg be likely to be overpowered by superior numbers, Port Hudson could not evacuated and the garrison there thrown upon Grant's flank, easily restoring the equilibrium.
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