From Pensacola.
--The Burning of the Dry Dock--The Pensacola correspondent of the Columbus Sun furnishes the subjoined account of the burning of the Dry Dock, which we have heretofore briefly noticed:‘ Last night (Sept. 2) about 11 o'clock, the skies were illuminated by the light of a fire at the Navy-Yard which proved to be the famous Dock which old Brown refused to let us meddle with. The steamer from the yard this morning, corroborated the belief of our citizens here, as to its being the Dock. Many thought it was burned by the Lincolnites, but I have ascertained that it was done by orders from Gen. Bragg. Why it was done, nobody knows; but it was for a purpose beneficial to us, or Gen. Bragg would not have ordered it done.
Quite an excitement was caused by the discovery of the burning of the Dock, which was heightened this morning about 9 o'clock, by sudden firing from towards the frigate Colorado, which proved to be the arrival of the sloop-of-war Savannah, which I had noticed with the glass for some time coming along from the Eastward. On the arrival of the Savannah she fired a salute of thirteen guns, a Commodore's salute, which was answered by the Colorado with nine guns. At the commencement of the firing the city was in agitation, believing that it was opened on account of the burning of the Dock. But it was soon dispelled on discovering the masts of the new vessel in the fleet.
The Dry Dock burned all night, and smoke is seen from it now. About 2 o'clock, several explosions took place on it, occasioned by the fire coming in contact with several kegs of powder which had been placed there under the engines some time ago, when an effort was made to sink it in the channel. The powder was placed there for the purpose of blowing it up, it case the Lincolnites captured it.
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