The following telegram received at Washington 3 p.m. April 10, 1864, from Culpeper Court-House, Va., 10 p.m., dated April 9, 1864: "Major-General H.W. HALLECK, "_Chief of Staff_: "Will you please ascertain if General F.P. Blair is to be sent to General Sherman. If not, an army-corps commander will have to be named for the Fifteenth Corps. "U.S. GRANT, _Lieutenant-General_." WASHINGTON, _April 20, 1864_. The PRESIDENT: You will do me a great favor by giving the order assigning me to the command of the Seventeenth Army Corps immediately, as I desire to leave Washington the next Saturday to join the command. I also request the assignment of Captain Andrew J. Alexander, of Third Regiment United States Cavalry, as adjutant-general of the Seventeenth Corps, with the rank of lieutenant-colonel. The present adjutant, or rather the former adjutant, Colonel Clark, has, I understand, been retained by General McPherson as adjutant-general of the department, and the place of adjutant-general of the corps is necessarily vacant. I also request the appointment of George A. Maguire, formerly captain Thirty-first Missouri Volunteer Infantry, as major and aid-de-camp, and Lieutenant Logan Tompkins, Twenty-first Missouri Volunteer Infantry, as captain and aid-de-camp on my staff. Respectfully, FRANK P. BLAIR. [Indorsements.] APRIL 21, 1864. HONORABLE SECRETARY OF WAR: Please have General Halleck make the proper order in this case. A. LINCOLN. Referred to General Halleck, chief of staff. EDWIN M. STANTON, _Secretary of War_. EXECUTIVE MANSION, _Washington, April 23, 1864_. HONORABLE SECRETARY OF WAR. MY DEAR SIR: According to our understanding with Major-General Frank P. Blair at the time he took his seat in Congress last winter, he now asks to withdraw his resignation as major-general, then tendered, and be sent to the field. Let this be done. Let the order sending him be such as shown me to-day by the Adjutant-General, only dropping from it the names of Maguire and Tompkins. Yours, truly, A. LINCOLN. [Indorsement.] APRIL 23, 1864. Referred to the Adjutant-General. EDWIN M. STANTON, _Secretary of War_. WASHINGTON CITY, D.C., _April 23, 1864_. Hon. E.M. STANTON, _Secretary of War_: I respectfully request to withdraw my resignation as major-general of the United States Volunteers, tendered on the 12th day of January, 1864. Respectfully, FRANK P. BLAIR. GENERAL ORDERS, No. 178. WAR DEPARTMENT, ADJUTANT-GENERAL'S OFFICE, _Washington, April 23, 1864_. I. Major-General F.P. Blair, jr., is assigned to the command of the Seventeenth Army Corps. II. Captain Andrew J. Alexander, Third Regiment United States Cavalry, is assigned as assistant adjutant-general of the Seventeenth Army Corps, with the rank of lieutenant-colonel, under the tenth section of the act approved July 17, 1862. By order of the President of the United States: E.D. TOWNSEND, _Assistant Adjutant-General_.