Well the thing to remember is he was being honored much more for his service in the Civil War then as President. He knew from the beginning how to defeat Lee when so many other generals had failed. Grab ahold of him and dont let go! He found a core of very good Generals he trusted and then gave them their orders and backed them completely. Sherman and Sheridan were two who come to mind ("Grant stood by me when I was crazy, and I stood by him when he was drunk, and now we stand by each other." William Sherman). He was not a political General ala McClellan who tended to see other contemporaries as rivals for office.
Remember when died in 1885 the Civil War had been over only 20 years and there was still a great many Union veterans who still revered him.
Remember when died in 1885 the Civil War had been over only 20 years and there was still a great many Union veterans who still revered him.