General Grant was coming to Chattanooga to assume supreme command; but as my chances of being allowed to join his headquarters were no better than with General Thomas, I concluded not to run the risk of a refusal, but to content myself where I was. It was fortunate for me that Mr. Dana returned, as he became my main reliance for correct information relative to the plans of the Commanding General, which he imparted and discussed with me freely, knowing that I would not make improper use of it. Next to him, General W. F. Smith, the engineer-in-chief, whose acquaintance I had made at Fredericksburg, General Meigs, the Quartermaster-General of the United States Army, whom the Secretary of War had sent to Chattanooga immediately after the battle, and the old division commanders of the Army of the Cumberland, were helpful to me. The scene of current events was also so confined that any occurrence of importance could hardly escape my notice.