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[449] completely command the rear of Fort Jackson and Battery Lee at the short rifled gun range of one mile and one-eighth.

I will here remark that an unfortunate mistake was made in locating the obstructions and defences at Savannah River. The two are too far apart—one mile and one-eighth—and those defences are entirely under the control of batteries placed by an enemy on bluffs from Fort Boggs to Caustine's Bluff, so that, if any one of the lines of outworks was to fall into his hands, the series of them would necessarily have to be evacuated, and the enemy would then have the way open to establish the batteries already referred to commanding the defences on the river.

I then visited the battery of twelve guns (two 8-inch columbiads, two 42-pounders, seven 32-pounders, one 24-pounder, rifled, two 8-inch navy guns) at Thunderbolt, on St. Augustine Creek, above Caustine's Bluff, about six miles to the southwest of Savannah. This is naturally a strong position, with good traverses between the guns, to prevent enfilade fire from Liberty Island, about one and a quarter miles off. Excepting the two extreme guns, which are not yet sufficiently protected, several of these guns are also exposed to rear fire from the Isle of Hope, about two miles off in a southwest direction.

The front of the battery is exposed to direct fire of Whitemarsh Island, about three-quarters of a mile off in a southeast direction. The woods on this and Liberty Island have been ordered to be cleared. Should the enemy put strong and numerous batteries on those three islands, the battery at Thunderbolt might be made untenable. It is also liable to the objections already referred to, relative to Caustine's Bluff, of being turned, in case any of the other outworks should fall.

Savannah, Oct. 22d, 1862.
I went this day to visit the battery at Beaulieu, of eight guns (two 42pound-ers, five 32-pounders, one 12-pounder, rifled), twelve miles from Savannah, with a fine road leading to it. It is a good position, commanding the Vernon River. The guns are well protected from enfilade fire by heavy traverses, and the whole battery is in a very fine condition. The magazines appear to be quite dry. Several of the guns are without elevating-screws, which must be furnished.

I visited also the Isle of Hope Causeway, connecting the latter island to the main-land, with a very fine road to Savannah, only about eight miles from the latter place. This is a very important line of communication, and one by which all the outer works can be turned, and the causeway should be commanded by a battery for two guns (siege 24-pounder howitzers, on each side of it); at present only a rifle-pit has been established, with a position for a field-gun.

Savannah, Oct. 24th, 1862.
I visited to-day the battery at Genesis Point, nine miles below the Savannah, Albany, and Gulf Railroad, and twenty-five miles from the city. It commands the Great Ogeechee. It is armed with seven guns (one 8-inch columbiad, one 42-pounder, and five 32-pounders). This position is a strong one, which, I am informed, cannot be turned or flanked. The armament is too light; two or more heavy or rifled guns should be sent there immediately. A row of piles

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