modern turrets, and Eberle was assigned duty as the forward turret officer. Spanish–American War and rise to senior command Oregon was still operating along the Pacific coast in the spring of 1898 when Congress declared war on Spain; the ship promptly won great renown by its race south from Puget Sound to Cape Horn and then north to the Caribbean to join American forces blockading Cuba. Eberle distinguished himself during the Battle of Santiago de Cuba by the outstanding performance of his turret in its duel with Spanish cruiser and, later, in its bombardment of Spanish troop concentrations at Caimanera. From this time on, Eberle reportedly enjoyed the favor of powerful officers in the navy. His promotion to lieutenant came on March 3, 1899, some three months before he was detached from Oregon and transferred to the cruiser , in which he served, briefly, as flag lieutenant and acting Chief of Staff of the Commander-in-Chief of the Asiatic Fleet, Captain Albert S. Barker during the Philippine–American War. Later that summer, Eberle returned to Annapolis to become aide to the superintendent of the Naval Academy, Commander Richard Wainwright. Besides carrying out the duties of that position, he busied himself in studying ordnance and in writing manuals for the use of guns and torpedoes and for the operation of wireless communication by warships. The first manual he wrote while there, was Gun and Torpedo Drills for the United States Navy, the Bureau of Navigation's first publication covering drill procedures for modern guns and torpedoes. Eberle next served as gunnery officer on the battleship in 1901 and 1902. In September 1902, Eberle became aide to the commandant of the New York Navy Yard, Rear Admiral Barker. In his short time in New York, he was temporarily detailed to serve as aide to British Admiral Lord Charles Beresford during his visits to New York in September and January. In October, he served in like capacity for the Crown Prince of Siam's visit there. In April 1903, Rear Admiral Barker became Commander in Chief of the Atlantic Fleet, and brought Eberle along to again serve as his flag lieutenant. During this two-year assignment, Eberle assisted in installing the first wireless telegraphs on naval vessels, and developed the early procedures and practical uses of the new communication equipment. On November 23, 1904, Eberle received a promotion to lieutenant commander, followed by a short tour as instructor