[NOTE.-Differs but slightly from memoranda immediately preceding.]

ENGINEER'S OFFICE, ISLAND Numbers 10, MISSISSIPPI RIVER,

March 24, 1862.

Memoranda of batteries at Island Numbers 10, Madrid Bend, with guns mounted, &c.

Batteries. Number of Caliber. Remarks.

guns.

Numbers 1 6 (3 naval 3 8-inch The Belmont

(redan).. iron carriages columbiads and heavy rifled

and 3 3 smooth-bore 32, while

barbette). 32s. being fired at

the enemy on

the 21st

instant, burst

at the third

fire, injuring

no one. An 8-

inch columbiad

was at once

mounted in its

place.

Numbers 4 (high 3 rifled 32s

2........ barbette and 1 smooth-

carriages). bore 32.

Numbers 3 (high 3 rifled 32s.

3........ barbette

carriages).

Numbers 4 (high 3 rifled 32s

4........ barbette and 1 8-inch

carriages). columbiad.

Numbers 7 (2 high 1 rifled 32, 3

5........ barbette and 5 8-inch

medium). columbiads, 3

smooth-bore

32s.

-

24 guns on the

main-land.

Numbers 1 6 (medium 2 8-inch

(Belmont barbette)..... columbiads and

Battery). 4 smooth-bore

32s.

Numbers 4 (3 barbette 3 smooth-bore

2........ and 1 center 32s and 1

pintle). rifled 24.

Numbers 5........... 2 rifled 24s,

3........ 1 8-inch

columbiad, 2

smooth-bore

32s.

Numbers 2 (siege 2 8-inch

4......... carriages).... howitzers.

Numbers 2 (siege 2 8-inch

5......... carriages).... howitzers.

-

19 guns on the

island.

NOTE.- In the redan, Battery Numbers 1 but three guns were used against the attack of the enemy's fleet and during the bombardment of Island Numbers 10. This battery, commanded by Captain Rucker, had six guns. The three smooth-bore 32s were not fired; only the three 8-inch columbiads. The three latter guns in the redan and one other similar in Battery Numbers 5 have been mounted and ready for action for some two months past. The four 8-inch columbiads are guns that I brought down from the naval floating battery and mounted them immediately. Thirty-five guns have been mounted on platforms and in batteries since March 1 by the Engineer Corps, including the Sappers and Miners. The naval floating battery was placed by us in position on the north side of the island, and now mounts nine guns making, in all, fifty-two guns in position at the present time.

I am, very respectfully,

A. B. GRAY,

Captain, C. S. Army, Chief Engineer Island Numbers 10.

Major General JOHN P. McCOWN.

10 R R-VOL VIII