Within a few weeks after the surrender of Lee, every army and fragment of an army opposed to the Union was dissolved. But meantime Lincoln had been assassinated, and the executive administration of the nation had devolved upon Andrew Johnson. This wrought an immense change in the aspect of national affairs. Lincoln was a strong, wise, conservative, magnanimous soul. Johnson was arrogant, vain, narrow, and contentious. Grant soon established his headquarters at the War Department, and devoted himself with characteristic energy to the work of discharging from the military service the great armies of volunteers no longer needed. Their work as soldiers was gloriously complete. Within a few months they were once more simple citizens of the Republic, following the ways of industry and peace. The suddenness of the transformation by which at the outbreak of hostilities hundreds of thousands of citizens left their homes and their occupations of peace to become willing soldiers of the Union and liberty, was paralleled by the alacrity of their return, the moment the danger was passed, to the stations and the manner of life they had abandoned. General Grant was the central figure in the national rejoicing and pride. The desire to do him honor was universal. But he bore himself through all with dignity and modesty, avoiding as much as he could, without seeming inappreciation and disdain, the lavish popular applause that greeted him on every possible occasion. In July, 1866, Congress created the grade of general, to which he was at once promoted, thus attaining a rank never before granted to a soldier of the United States. His great lieutenant, Sherman, succeeded him in this office, which was then permitted to lapse, though it was revived later as a special honor for General Sheridan. In further token of gratitude, some of the wealthier citizens purchased and presented to Grant a house in Washington. Resolutions of gratitude, honorary degrees, presents of value and significance, came to him in abundance. Through it all, he maintained his reputation as a man of few words, devoid of ostentation, and with no ambition to court public favor by any act of demagoguism.