Origins of "Taps"

I was at a Memorial Service at Copley, OH yesterday and they read the following story before playing Taps. It was pretty moving.

It all began in 1862 during the Civil War, when Union Army Captain Robert Ellicombe was with his men near Harrison's Landing in Virginia. The Confederate Army was on the other side of the narrow strip of land. During the night, Captain Ellicombe heard the moans of a solder who lay mortally wounded on the field. Not knowing if it was a Union or Confederate soldier, the Captain decided to risk his life and bring the stricken man back for medical attention.
Crawling on his stomach through gunfire, the Captain reached the stricken soldier and began pulling him toward his encampment. When the Captain finally reached his own lines, he discovered it was actually a Confederate soldier but the soldier was dead. The Captain lit a lantern and suddenly caught his breath and went numb with shock. In the dim light, he saw the face of the soldier. It was his own son. The boy had been studying music in the South when the war broke out. Without telling his father, he enlisted in the Confederate Army.
The following morning, heartbroken, the father asked permission of his supervisor to give his son a full military burial despite his enemy status. His request was partially granted. The Captain had asked if he could have a group of Army band members play a funeral dirge for his son at the funeral. The request was turned down since the soldier was a Confederate but out of respect for the father, they did say they could give him only one musician. The Captain chose a bugler. He asked the bugler to play a series of musical notes he had found on a piece of paper in the pocket of the dead youth's uniform. This wish was granted. The haunting melody we know as "Taps" used at military funerals was born.
These are the words to "Taps":

"Day is done,
Gone the sun,
From the lakes,
From the hills,
From the sky.
All is well.
Safely rest.
God is nigh."

Today, I searched for the story and found it appears this story is fiction according the www.truthorfiction.com
http://www.truthorfiction.com/rumors/t/taps.htm

According a researcher at West Point, there is no historical evidence that anyone named Robert Ellicombe even existed in the Union army. Master Sergeant Jari Villanueva is a part of the United States Air Force Band and is not only a historian about the tune "Taps," but is working on an exhibit for Arlington National Cemetery about bugle calls. Both he and Kathryn Shenkle, Historian for Arlington National Cemetery, agree that "Taps" came from Brig. General Daniel Butterfield at Harrison's Landing in Virginia in 1862. Sgt. Villanueva has found correspondence from both General Butterfield and a bugler which confirm the origins, although there are some minor discrepancies in their letters.