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[448]

This battery (two thirteen-inch mortars) will continue firing at the rate of fifteen minutes to each mortar alternately, varying the charge of mortars and length of fuse, so that the shells will drop over the arches of the north and north-east faces of the work, and explode immediately after striking, but not before.

The other batteries will open as follows, namely:

Battery Stanton, (three thirteen-inch mortars, three thousand four hundred yards distant,) immediately after the signal, at the rate of fifteen minutes for each piece, alternately from the right; charge of mortar fourteen pounds, charge of shell seven pounds, elevation forty-five degrees, and length of fuse twenty-three seconds, varying the charge of mortar and length of fuse as may be required. The shells should drop over the arches of the south face of the work, and explode immediately after striking, but not before.

Battery Grant, (three thirteen-inch mortars, three thousand two hundred yards distant,) immediately after the ranges for battery Stanton have been determined, at the rate of fifteen minutes for each piece, alternately from the right; charge of shell seven pounds, elevation forty-five degrees, charge of mortar and length of fuse to be varied to suit the range, as determined from battery Stanton. The shells should drop over the arches of the south face of the work, and explode immediately after striking, but not before.

Battery Lyon, (three ten-inch columbiads, three thousand one hundred yards from the work,) with a curved fire, immediately after the signal, allowing ten minutes between the discharges for each piece, alternating from the right; charge of guns seventeen pounds, charge of shell three pounds, elevation twenty degrees, and length of fuse twenty seconds; the charge and length of fuse to vary as required. The shell should pass over the parapet into the work, taking the gorge and north face in reverse, and exploding at the moment of striking or immediately after.

Battery Lincoln, (three eight-inch columbiads, three thousand and forty-five yards from the work,) with a curved fire, immediately after the signal, allowing six minutes between discharges for each piece, alternating from the right; charge of gun ten pounds, charge of shell one and a half pounds, elevation twenty degrees, and length of fuse twenty seconds, directed the same as battery Lyon, upon the north face and gorge in reverse, varying the charge and length of fuse accordingly.

Battery Burnside, (one thirteen-inch mortar, two thousand seven hundred and fifty yards from the work,) firing every ten minutes, from the range as obtained for battery Sherman; charge of shell seven pounds, elevation forty-five degrees, charge of mortar and length of fuse varying as required from those obtained for battery Sherman. The shells should drop on the arches of the north and north-east faces, and explode immediately after striking, but not before.

Battery Sherman, (three ten-inch mortars, two thousand six hundred and fifty yards from the work,) commencing immediately after the ranges for battery Grant have been determined, and firing at the rate of fifteen minutes for each piece, alternating from the right; charge of shell seven pounds, elevation forty-five degrees, charge of mortar and length of fuse to be fixed to suit the range as determined from battery Grant. The shells should drop over the arches of the north and north-east faces.

Battery Scott, (three ten-inch and one eightinch columbiad, one thousand six hundred and seventy-seven yards from the work,) firing solid shot, and commencing immediately after the barbette fire of the works has ceased. Charge of teninch columbiads twenty pounds, elevation four and a half degrees; charge of eight-inch columbiad ten pounds, elevation five degrees. This battery should breach the pancoupe between the south and south-east faces, and the embrasure next to it in the south-east face; the elevation to be varied accordingly, the charge to remain the same. Until the elevation is accurately determined, each gun should fire once in ten minutes, after that, every six or eight minutes.

Battery Sigel, (five thirty-pounder Parrotts and one twenty-four pounder James, one thousand six hundred and twenty yards from the work,) to open with four and three fourth seconds fuse on the barbette guns of the Fort at the second discharge from battery Sherman. Charge for thirty-pounders, three and one fourth pounds; charge for twenty-four pounder, five pounds; elevation, forty degrees for both calibres.

As soon as the barbette fire of the works has been silenced, this battery will be directed, with percussion-shells, upon the walls, to breach the pancoupe between the south and south-east faces, and the embrasure next to it in the south-east face; the elevation to be varied accordingly, the charge to remain the same. Until the elevation is accurately determined, each gun should fire once in six or eight minutes; after that, every four or five minutes.

Battery McClellan (two forty — two and two thirty-two-pounders James, one thousand six hundred and twenty yards from the work) opens fire immediately, after battery Scott. Charge for forty-two-pounder, eight pounds; charge for thirty-two-pounder six pounds; elevation of forty-two-pounder four and one fourth degrees, and thirty-two-pounder, four degrees. Each piece should fire once every five or six minutes after the elevation has been established; charge to remain the same. This battery should breach the works in the pancoupe between the south and south-east faces, and the embrasure next to it in the south-east face. The steel scraper for the grooves should be used after every fifth or sixth discharge.

Battery Totten (four ten-inch siege-mortars, one thousand six hundred and eighty-five yards from the work) opens fire immediately after battery Sigel, firing each piece about once in five minutes; charge of mortar three and a half pounds, charge of shell three pounds, elevation forty-five degrees, and length of fuse eighteen and a half seconds. The charge of mortar and length


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