Tidwell revisited

[RJNorton]

John, when you mentioned Grant as a target for assassination, were you referring to what happened on his train which had departed Washington prior to Lincoln's assassination? Apparently a man had been assigned to kill Grant, but when he tried to enter Grant's train car, he was turned back by railroad employees. Then, in a sign of remorse, he later wrote Grant one or more letters saying he was glad he failed in his mission. Do you know if any of these letters still exist? Was the name of the man ever revealed? Did his orders come from Booth?