I am the great-great-great nephew of Lt. Col. Alexander Haynes and the great-great-great grandson of his younger brother William H. Hanes (listed as "Junior" in the offical records due to the presence of and older soldier with the same name.)
Alexander was elected captain of Co. E raised in Hillsville. For detailed information about the 29th VA I suggest reading John Perry Alderman's book about the 29th. It is part of the Virginia Regimental History series. The book is out of print, but I found one at the Civil War visitor's Center in Richmond a few years ago. The library in Hillsville, VA has a copy. I also have the Compiled Service Record for Alexander and he was with the 29th continously until he was wounded at Drewry's Bluff in mid May 1864. He died on May 30th of '64 in General Hospital #4 in Richmond and was buried in Hollywood Cemetery. I hope you find Alderman's book helpful. There is another book about the 29th available from Lulu press--"The Diary of Pvt. Johnny Hess." Hess was a private in Co. G of the 29th.
Richard Hanes (my g-grandfather dropped the "y" when he moved to NC)