well, elsewhere union armies were capturing nashville, new orleans, memphis, vicksburg, port hudson, chattanooga, for the purposes of our story, the colored troops in virginia were overwhelmingly recruited in the northern states and were no more use at first than an equal number of new white regiments. this is an important point because, as i found out while researching the book, escaped slaves were a source of expert local knowledge to union armies, going at least back to the landing in south carolina in the fall of 1861 when an escaped slave known to us only as brutus advised captain quincy adams gilmore, an officer of engineers, gilmore called brutus the most intelligent slave i have met here, quite familiar with the rivers and creeks between savannah city and tiebee island. he made his escape last week in a canoe. two years later, when the commander of a union raid up the yazoo river in mississippi wanted to send a message to his headquarters in vicksburg, two sergeants of the third mississippi colored cavalry dressed as slaves, which they had been until recently, and delivered t