Sir: The colors of the United States were triumphantly planted ashore, in full view of the city and castle, and under the distant fire of both, in the afternoon of the 9th inst. Brevet Brigadier-General Worth's brigade of regulars led the descent, quickly followed by the division of United States volunteers under Major-General Patterson, and Brigadier-General Twiggs' reserve brigade of regulars. The three lines successively landed in sixty-seven surf-boats, each boat conducted by a naval officer, and rowed by sailors from Commodore Conner's squadron, whose lighter vessels flanked the boats so as to be ready to protect the operation by their cross-fire. The whole army reached the shore in fine style, and without direct opposition (on the beach), accident or loss, driving the enemy from the ground to be occupied.
The line of investment, according to General Orders, No. 47, was partially taken up the same night; but has only been completed to-day, owing to most extraordinary difficulties: 1. The environs of the city, outside of the fire of its guns and those of the castle, are broken into innumerable hills of loose sand, from 20 to 250 feet in height, with almost impassable forests of chapparal between; and 2. Of all our means, of land transportation: wagons, carts, pack-saddles, horses and mules, expected to join us from Tampico and the Brazos, weeks ago, but fifteen carts and about one hundred draught-horses have yet arrived. Three hundred pack-mules are greatly needed to relieve the troops in taking subsistence alone, along the line of investment of more than five miles, as, at present, our only depot is south of the city. On the cessation of the present raging norther, which almost stifles the troops with sand, sweeping away hills and creating new, I hope to establish a second depot north of the city, which will partially relieve the left wing of the army.
In extending the line of investment around the city, the troops for three days have performed the heaviest labors in getting over the hills and cutting through the intervening forests, all under the distant fire of the city and castle, and in the midst of many sharp skirmishes with the enemy. In these operations we have lost in killed and wounded several valuable officers and men. Among the killed I have to report Brevet Captain Alburtis, of the United States 2d Infantry, much distinguished in the Florida war, and a most excellent officer. He fell on the 11th inst., and Lieutenant-Colonel Dickenson, of the South Carolina Regiment, was badly wounded in a skirmish the day before. Two privates have been killed in these operations, and four or five wounded. As yet I have not been able to obtain their names.
As soon as the subsistence of the troops can be assured, and their positions are well established, I shall, by an organized movement, cause each brigade of regulars and volunteers to send detachments, with supports, to clear its front, including sub-bourgs, of the enemy's parties, so as to oblige them to confine themselves within the walls of the city.
I have heretofore reported that but two-sevenths of the siege-train and ammunition had reached me. The remainder is yet unheard of. We shall commence landing the heavy metal as soon as the storm subsides, and hope that the five-sevenths may be up in time.
The city being invested, would, no doubt, early surrender, but for fear that, if occupied by us, it would immediately be fired upon by the castle. I am not altogether without hope of finding the means of coming to some compromise with the city on this subject.
So far, the principal skirmishing has fallen to the lot of Brigadier-General Pillow's and Quitman's brigades. Both old and new volunteer regiments have conducted themselves admirably. Indeed, the whole army is full of zeal and confidence, and cannot fail to acquire distinction in the impending operations.
To Commodore Conner, the officers and sailors of his squadron, the army is indebted for great and unceasing assistance, promptly and cheerfully rendered. Their co-operation is the constant theme of our gratitude and admiration. A handsome detachment of marines, under Captain Edson, of that corps, landed with the first line, and is doing duty with the army.
March 13th. The enemy, at intervals, continues the fire of heavy ordnance, from the city and castle, upon our line of investment, both by day and night, but with little or no effect.
The norther has ceased, which has renewed our communication with the storeships at anchor under Sacrificios. We shall immediately commence landing the few pieces of heavy ordnance, with ordnance stores, at hand, and hope soon to have the necessary draught mules to take them to their positions. Any further delay in the arrival of those means of transportation will be severely felt in our operations.