That is a quote from Alfred Hough's Soldier in the West. I have posted about the problems with the quote on other threads on this site. Basically it was from an autobiography that was written from 1875 to 1890. The complication is that Hough wrote letters to his wife in 1863. In those letters he doesn't discuss Rosecrans' mental or physical condition. This is not to say that what he wrote in the quote above was incorrect but it is still not as trustworthy as something written shortly after the events. One can learn more about Hough and his papers -many of which were destroyed- via this link:
http://babel.hathitrust.org/cgi/pt?id=mdp.39015005159283;view=1up;seq=158
It is one of the surprisingly few negative assessments of Rosecrans after Chickamauga that I have come upon in my research.
There is the JD Cox retelling of what he says Garfield told him but that is secondhand and wasn't published until 1900.
There are Charles Dana's telegrams sent to Washington but his first few telegrams after Chickamauga were optimistic about Rosecrans and the future of the AotC. Dana later wrote Rosecrans that what he wrote in 1863 may have been misinformed and unfair.
There was an anonymous letter written by an officer of the AotC (possibly William Hazen) that was published in a number of newspapers.
Newspaperman Wm Shanks also wrote negatively about Rosecrans.
There were also newspaper opinion pieces that accused Rosecrans of opium eating among other thing.
That is what I have found. I would be interested in seeing other negative assessments made by people who were there and written relatively close in time to the events.
Bringing the