I wrote a book on the 4th NC Cavalry, which was published in 2003 by McFarland & Co. You can see more details about the book at www.amazon.com. Your Isaac Deal is listed on p. 137 of the book's roster section. He enlisted in New Hanover Co., NC on 7/8/1862. He married Hannah S. Henderson on Sept. 16, 1860. He was present or accounted for through Oct. 1864. He was paroled at Farmville, VA in April 1865. Sorry no info on grave, but I hope this is of some help.

Sincerely,
Neil Raiford
author of The 4th North Carolina in the Civil War