[From our Army Correspondent]

From the Ninth Regiment.

ON BOARD STEAMSHIP "COATZACOALCO," Chesapeake Bay, off Annapolis, Md., Sunday Evening, Oct. 20, 1861.

Dear Editor:—Although you have received no communication from me, I have not forgotten the promise I made to write you, when with your "God-bless-you" and a firm grasp of the hand I stepped upon the platform of the car and with the ninth Maine left you to engage in the great struggle to preserve the Union, and our country's Flag from dishonor. In the same style you saw us leave the old Boston and Maine Depot, we entered Washington. But on arriving there we were marched from one station to another by order of Brigadier Generals who were anxious to get us into their Brigade. It seems that on the arrival of volunteer regiments at Washington these Generals act very similar to hackmen in Boston and New York, who, on the arrival of a stranger, surround him and almost compel him to ride—the one getting him is the best fellow. Our regiment was marched about by these generals a number of miles needlessly before we got a permanent designation, which is General H. G. Wright's Brigade, General T. W. Sherman's Division. We were encamped at Bladensburg toll gate, about two miles north of the Capitol a week, when orders came for us to "strike" tents and embark on board the cars for Annapolis, where on a plantation in the outskirts of the city we have been encamped until last evening when orders came for us to prepare to embark on board steamer Coatzacalcos, one of twenty ocean steamships lying off the bar. Our regiment, the last of fifteen thousand troops of Light Infantry and Riflemen, including Sherman's full Battery got aboard finely about 5 o'clock this (Sunday) morning, and are now waiting orders to sail for Fortress Monroe, where we are to be joined by as many more troops and a fleet of gunboats and ships of war. The ship "Great Republic" has eight hundred horses aboard, belonging to artillerists, who go with us from the fortress.—From our movements I am lead to believe that an action is anticipated before we land or immediately alter. Be it as it may, I am sure the Maine ninth will prove itself equal to the anticipation of the thousands who are anxiously looking to it at home.

I have written this with the expectation that the little steamboat plying about the Bay and visiting other steamers will come to us that I may send this to Annapolis to be mailed to you.

Monday morning, 11 o'clock.—The little steamer did not come to us and we have weighed anchor and started for the fortress. It is a beautiful day and the ships steaming along beside and near us, look magnificently. The bands are playing favorite airs, making one almost believe he is on an excursion of pleasure rather than a mission of death.

The soldiers scattered in groups about the decks are enjoying themselves as most inclined—some reading, some singing, some playing cards, (the favorite game among the card players is the "one cent anty,") while a few are talking and praying as the Spirit moves them. How long we are to remain at Fortress Monroe is impossible to tell. Although but a day or two, I think; yet I hope long enough for me to get this mailed to you. As opportunity affords I will write you of the movements of the Maine ninth and the "Soger Boy," LUVILLE.