The great parade and review of the United States troops, which is to take place at Washington today and tomorrow, will surpass anything of the kind ever before witnessed in this century. The Army of the Potomac, the Army of the James, the Army of Georgia, the Army of the Tennessee and the cavalry of General Sheridan will all pass in review and number probably two hundred thousand brave and veteran troops who have served on many a victorious battlefield. They will be commanded, on the imposing occasion, by all the leading generals of the service, and be reviewed by Lieutenant General Grant and President Johnson and his Cabinet, who, with the Diplomatic Corps and other distinguished officials, will be stationed on Pennsylvania avenue in front of the White House.
The troops to be reviewed today will consist of the Army of the Potomac, General Sheridan's cavalry and the Ninth Corps, under command of Major General Meade. Tomorrow the army commanded by Major General Sherman, consisting of the Army of Georgia, under command of Major General Slocum, and the Army of Tennessee, under Major General Howard, will be reviewed.
During yesterday most of the troops were marched over from their camps in Virginia, across the Long Bridge, and took positions eastwardly in the vicinity of the national capitol. After each review the columns will march around the capitol and thence through Pennsylvania avenue westwardly as far as Georgetown, to be again distributed by a pontoon and the aqueduct bridge, throughout their respective camps on the south side of the Potomac. From the official programme for today's parade and review was extracted the following:
The cavalry corps will form on Maryland avenue, with the head of the column abreast at the northern entrance to the capitol, prepared to move at precisely 9 o'clock A.M. The 9th corps will form on East Capitol street, the head of the column on First street east, at 6 o'clock A.M. on the 23d inst., prepared to follow the cavalry. The 5th corps will form on Pennsylvania avenue, with the head of the column on First street east, with the head of the column to follow the 9th corps.
The Engineer brigade, and the Provost Marshal General's brigade, will take position on A street north, prepared to follow the cavalry. The 2d corps will form a column on the streets of the Fifth ward, south of Pennsylvania avenue, prepared to follow the 5th corps, on First street east.
The formation of the column will be by companies, closed in mass, withshortened intervals between regiments, brigades and divisions. For the sake of uniformity, and to pass narrow portions of the street, the company front will be, throughout the army, 20 files.
The cadence step will be taken from the Capitol until after passing Seventeenth street, from the President's House. Arms will be carried at right-shoulder-shift from the Capitol to the front of the State Department.
After passing the reviewing officer and Seventeenth street, the cavalry moving briskly for 600 or 800 yards, will proceed to the Circle, (west end of the city,) and thence through the street north to its camp. The Provost Marshal General's brigade, the Engineer's Brigade, and the Fifth Corps will march via Bridge street, Georgetown, and the Aqueduct bridge, to Ball's Crossroads, and thence to their camps.
The Ninth and Second Corps will move across the Potomac via the pontoon bridge at the foot of High street, Georgetown, turning off at the Circle, through K street, and taking the lower road, past Arlington House, to Columbia pike, will move to their camps. Corps commanders will see that after passing Seventeenth street the gait will be increased by regiments, and will take advantage of any of the side streets to mass their commands or portions of them.
Reopening of Southern Ports. -- President Johnson has issued a proclamation announcing that after July 1st, all Southern ports except those in Texas, will be opened to foreign trade.
Steamers at a Discount. -- The steamers Cahawba and Detroit, belonging to the government, were put up at auction of Friday, in New York. The best bid for the Cahawba, which cost the government over $200,000, was $15,000, and for the Detroit $8,000. The sale was stopped and the vessels were withdrawn. The large number of steamers belonging to the government, which will have to be sold, will probably make that class of property very cheap for some time to come.