During the day on April 14, 1865, Lincoln signed the law that created the secret service, the US President's security force. On the evening of April 14, Lincoln went to attend a play with his wife, Mary Todd at Ford's Theater in Washington, D.C.. He had invited Ulysses S. Grant to attend the play with him and his wife Mary Todd, and Grant planned to attend. As a general, Grant would have brought his own extra military security force, but he did not attend the play because his wife Julia and Mary Todd did not get along well.