Battle of San Juan Hill (English Wikipedia)

Armstrong 1982, p. 104: "Well before the American infantry had reached the top of the heights, Capt. Lyman Kennon of the 6th Infantry and Capt. James B. Goe of the 13th Infantry reported that they personally observed Spanish troops running away to escape the Gatling fire." Armstrong, David A. (1982). Bullets and Bureaucrats: The Machine Gun and the United States Army, 1861–1916. ABC-CLIO. ISBN 978-0-313-23029-5.
Parker 2006, Preface Parker, John H. (July 1, 2006). The Gatlings at Santiago. Echo Library. ISBN 978-1-84702-393-3.

genealogytrails.com

"Arizona Ranger Rynning". Genealogytrails.com. Archived from the original on September 16, 2016. Retrieved June 15, 2012.

Anthony L. Powell (1998). "Black Participation in the Spanish–American War". The Spanish–American War Centennial web site. Retrieved September 11, 2009.

"Arizona Ranger Rynning". Genealogytrails.com. Archived from the original on September 16, 2016. Retrieved June 15, 2012.