I stumbled across a tribute to the 4th U.S. Cavalry in the National Tribune while researching something totally unrelated. Unfortunately, I only have part of one column of the article on the page I received from USAHEC.
The author was a former volunteer cavalryman, and among other topics he seems to primarily write about actions around Corinth in October 1862.
“The 4th U.S. Cav. was as fine a regiment as was ever organized in any war. The discipline, the gallantry, the bravery and prowess of that regiment was not excelled by any regiment in any department of the armies of the United States”
He continues to write about other units who participated in the fight, including the 72nd Indiana Mounted Infantry, 5th Kentucky Cavalry, 3rd Illinois Cavalry, 2nd, 3rd and 4th Tennessee Cavalry, and the 2nd Iowa Cavalry. The last regiment was apparently instrumental in saving the day.
It seems all things these days are somehow connected to the 6th U.S. Cavalry, and I just realized this article has one, too. The commander of the 5th Kentucky Cavalry aat this time was none other than William Sanders, former captain of the 6th U.S. Cavalry and cousin of Jefferson Davis.
The article, for those who would like to look into this further, is the May 28, 1891 issue of the National Tribune, page 3, column 4 and possibly others (mine was in column 2).