Bruce Catton is famous for this

 

If you are talking of the Army of the Potomac series, it would be. About the Union.  I am currently reading the first one in the series and it is fabulous.  This is my area of concentration of study, the Army of the Potomac.  Even has a bit about the 62nd PVI in book 2   And I don,t see so much bias to the north either, comes right out pointing out what the south did right and what the north did wrong and visa versa.

 

Just beginning the reading, only about 40 pages, but thourghly enjoying it.

 

 

I also recommend "The Bloody Wheatfieldd" by Jay Jorgenson.  Best effort to date to explain what happened there.  Still a bit off, if he had taken a bit more time and tied up loose ends, would be excellent.  He tends to lose units in the field and misnames some.