[277] Many, including Grant himself, thought that he, Grant, had been a target in the plot, and during the subsequent trial, the government tried to prove that Grant had been stalked by Booth's conspirator Michael O'Laughlen.[278] Stanton notified Grant of the President's death and summoned him back to Washington. Vice President Andrew Johnson was sworn in as president on April 15. Attending Lincoln's funeral on April 19, Grant stood alone and wept openly; he later said Lincoln was "the greatest man I have ever known".[279] Grant was determined to work with Johnson, and he privately expressed "every reason to hope" in the new president's ability to run the government "in its old channel".[280]

Commanding General
Main article: Ulysses S. Grant as commanding general, 1865–1869
Ulysses S. Grant by Balling (1865)Constant Mayer's portrait of 1866
At the war's end, Grant remained commander of the army, with duties that included dealing with Maximilian and French troops in Mexico, enforcement of Reconstruction in the former Confederate states, and supervision of Indian wars on the western Plains.[281] After the Grand Review of the Armies, Lee and his generals were indicted for treason in Virginia. 