[2] Following the outbreak of the Philippine–American War in February 1899, Fiske participated in the Defense of Manila against Filipino Insurgents and other combat operations until his return to the United States in August 1901.

Their mission was to prevent fighting between the Cubans, to protect U.S. economic interests there, and to hold free elections in order to establish a new and legitimate government.

Fiske was stationed on Cuba and participated in the occupation duty until February 1909, when United States withdrew its troops following the election of José Miguel Gómez.

He was promoted to the temporary rank of lieutenant colonel soon afterwards and transferred to the Training Section (G-5) of the American Expeditionary Forces (AEF), commanded by Major General John J.

[2] There he served as Deputy to Section Chief, Colonel Paul B. Malone and faced many difficult situations during the training of the AEF troops.

Fiske insisted that all officers must attended the AEF staff and specialist schools upon arrival to France regardless of when the parent unit was scheduled to enter combat.

For his service in France, Fiske was decorated with Army Distinguished Service Medal based on the recommendation of General Pershing and also received several foreign decorations of Allied nations: Legion of Honour, rank Commander, French Croix de Guerre with Palm by the Government of France, the Order of Leopold from Belgium, and the Order of the Crown of Italy.

He was appointed an instructor at the Army Infantry School at Fort Benning, Georgia and a few months later was promoted again to the rank of lieutenant colonel.

Fiske remained in that capacity until April 1930, when he assumed command of 87th Infantry Division, the Organized Reserve of Louisiana, Alabama, and Mississippi.

Fiske, as Heidt's direct superior officer, subsequently pressed charges of criminal libel and Rounsevell was arrested and then released on $2,500 Bond.