I picked up this book as a resource on Halleck, expecting to find a
favorable treatment (don't most biographers find themselves attracted
to a historical figure in some way?).
Generally, I turn to the sections that cover November, 1862 - June 1863
and then read outwards from there ... so far, Marszalek has spent the
entire text roasting Halleck over a spit. I don't remember ever
reading a less favorable biography!
Given that he was expending so much energy flaming Halleck, I was
really surprised to find that he didn't cover AT ALL the frustrating
exchange of messages (or lack thereof) between Grant and Halleck during
Grant's move south to Oxford, and only lightly covered Halleck's
response to the threat posed by McClernand.