Here’s William J. Miller giving a talk at the American Civil War Center based on his book about the Battle of Tom’s Brook. The presentation leaves much to be desired in terms of organization and speaking mechanics, but he does has some fair information.
The video’s description reads, “George Custer and Tom Rosser were fast friends since their teenage days at West Point. War led them down separate paths, to have them converge in the open fields above Tom’s Brook in the Shenandoah Valley. Author William J. Miller explores the details of the overlooked cavalry action that influenced the balance of the Valley Campaign of 1864 and pitted two ambitious friends against each other.”