His name appears as Richard M. Bridges, although it sometimes appears as Richard R.M. Bridges. His service record shows he enlisted in August 1862, at Guntown, into Company K, of Wood's Regiment Confederate Cavalry. I suspect he joined this unit a year earlier in September 1861, when Dr. J.W. Barnett formed it in Yazoo County. He lived next door to Dr. Barnett and Dr. Leake in 1850 Yazoo. But I assume his unit wasn't mustered to see action at Shiloh.

Dr. Barnett transferred out to be among the Surgeons' serving Vicksburg (don't know when, early 1863?).

February 28, 1863, R.M. Bridges transferred to the Yazoo Minute Rifles, Co. K, of the 10th MS. And that unit was reorganized in March or April 1863, into the Phillips/Richards Company of the 18th MS Cavalry Battalion, aka Chalmers' Battalion.