Boston—Protected cruiser, 3,189 tons. Speed, 15.6 knots. Complement, 270. Armor, 1-1/2 inch deck. Guns, main battery, two 8-inch and six 6-inch rifles; secondary battery, rapid-fire, two 6-pounders and two 3-pounders. Captain F. Wildes.
Petrel—Fourth-rate cruiser, 890 tons. Speed, 13.7 knots. Guns, four 6-inch, two 3-pounder rapid-fire, one 1-pounder, and four machine guns. Commander E.P. Wood.
Concord—Gunboat, 1,710 tons. Speed, 16.8 knots. Armor, 3/8-inch deck. Guns, main battery, six 6-inch rifles. Commander Asa Walker.
Hugh McCulloch—Revenue cutter, light battery of rapid-fire guns.
Zafiro—Auxiliary cruiser: supply vessel.
The vessels under command of Admiral Montojo were the following:
Reina Cristina—Cruiser (flagship). Built in 1887, iron, 3,090 tons, 14 to 17.5 knots, according to draught, and a main battery of six 6.2-inch rifles.
Castilla—Cruiser, built in 1881, wood, 3,342 tons, 14 knots, and four 5.9-inch Krupps and two 4.7-inch Krupps in her main battery.
Velasco—Small cruiser, built in 1881, iron, 1,139 tons, and three 6-inch Armstrongs in her main battery.
Don Juan de Austria—Small cruiser, completed in 1887, iron, 1,152 tons, 13 to 14 knots, and four 4.7-inch rifles in her main battery.