As for Grant's drinking, until now I had not paid much attention to the issue, but after reading Bobrick's discussion on the matter, I see that this is another case where pro-Republican revisionists have tried to sweep the truth under the rug. The evidence that Grant had a drinking problem throughout the war is considerable and comes from a variety of sources (see Bobrick,
Master of War, pp. 223-225). A member of Grant's own staff, Dr. E. D. Kittoe, admitted the truth after the war. Or, just read the letter that Grant's chief of staff, General Rawlins, sent Grant in June 1863 (Bobrick, p. 224).
I applaud Brooks Simpson, with whom I rarely agree, for being willing to admit a decent-sized chunk of the truth about Grant's drinking problem:
https://cwcrossroads.wordpress.com/2011/03/13/grant-and-drinking-revisited/