Reinforcement...Hooker "in his cups" at Chancellorsville...French was the same way.
However, we can't ignore Grant, of whom Lincoln was supposed to have said "Find out what he is drinking, and order it for all my generals."
And there was Churchill: daily bottle of scotch before dinner, bottle of brandy after.
Grant and Churchill are interesting cases. FWIW, I don't think Grant was alcoholic, at least as the term is understood today. He never drank when anything was going on, he never drank under pressure, and he continued to drink socially through his White House years and beyond without incident. He did not deteriorate mentally or in character; indeed, the story of his memoirs, a minor literary classic written as he was dying and in chronic pain, is one of the finest chapters of his life. He also had, by all accounts, an uncommonly happy and devoted marriage. These are inconsistent with an alcoholic pattern.
My suspicion is that Grant had a few mishaps with alcohol, as many people do. He perhaps, as Shelby Foote once put it, "got drunk easily." The enduring question is what happened out on the west coast, when as a desperately lonely junior officer (he missed his wife) he may have sought refuge in the bottle. The purported Civil War episodes are problematic.The supposedly incriminating stories, mostly second and third hand, were told by people who had an ax to grindand and have been contested by historians.
But even if these happened, isolated incidents of the general getting drunk (even beastly drunk) in a social context does not make him an alcoholic. Every person who has one too many at the office Christmas party and makes a pass at the boss's wife is not an alcoholic. Every binging college student is not an alcoholic. As we use the term today, it is the pattern that counts: chronic, progressive, drinking in appropriate times and places, etc.