It seems that Phil Sheridan was not an ethical hunter. Interesting also that he had to publish his own memoirs himself (not enough commercial interest?). And my, he was certainly interested in viewing the Franco-Prussian War.
If he, Burnside and Chamberlain had made it to the Franco-Prussian War, each on his own desired terms, Sheridan could have observed Burnside's French forces be defeated by Chamberlain's Prussians. He then could have returned to the states to hear Sherman's analysis that the French were making good use of their defeat in learning new lessons, where the U.S. would need to suffer a similar disaster in order to correct its military sins.
There's a book in there somewhere.