From Vicksburg — the enemy falling back.
Mobile, May 29th.
--The special reports of the Advertiser and Register, at Jackson, states that the enemy have retired from the immediate front of the fortifications at Vicksburg, and are reported to be fortifying.
Want of water will force him back to the Big Black.
Col. Wirt Adams has had a spirited skirmish on the Yazoo, killing and wounding some 20 Yankees.