The Spanish American war was one of the first wars after the new fangled motion picture machine was invented by Edison with movies about the war by Edison Manufacturing Company and the American Mutoscope & Biograph Company. These movies are available at the Library of Congress website :

Films of the Beginnings of War

Burial of the "Maine" Victims
War Correspondents
N.Y. Journal Despatch Yacht "Buccaneer"
Wreck of the Battleship "Maine"
Morro Castle, Havana Harbor
U.S. Battleship "Indiana"
Secretary Long and Captain Sigsbee
"Vizcaya" Under Full Headway

Films of Military Preparations

10th U.S. Infantry, 2nd Battalion Leaving Cars
U.S. Cavalry Supplies Unloading at Tampa, Florida
Colored Troops Disembarking
9th Infantry Boys' Morning Wash
Military Camp at Tampa, Taken from Train
Transport "Whitney" Leaving Dock
Cuban Refugees Waiting for Rations
Troop Ships for the Philippines
Blanket-Tossing a New Recruit
Soldiers Washing Dishes
Trained Cavalry Horses
Roosevelt's Rough Riders Embarking for Santiago
Cuban Volunteers Embarking
Roosevelt's Rough Riders