USS Monadnock (BM-3). At sea

The second USS Monadnock was an iron‑hulled, twin‑screw, double‑turreted monitor of the Amphitrite class in the United States Navy which saw service in the Spanish–American War.
After fitting out Monadnock served as a unit of the Pacific Squadron along the west coast. During the next two years exercises and training cruises sent her along the Pacific coast from Puget Sound to the Baja California peninsula. After the outbreak of war with Spain, she was ordered to join George Dewey's fleet in the Philippines. She departed San Francisco, California on 23 June 1898, touched at Hawaii early in July, and reached Manila Bay on 16 August.

On February 10, 1899, several reports indicate the Monadnock participated in the Battle of Caloocan, a town a few miles north of Manila. She also participated in other fighting, such as late February shelling of a city.
https://en.wikipedia.org/wiki/USS_Monadnock_(BM-3)