On the morning of the 6 June, she dueled shore batteries briefly and, near Santiago and on 7 June, joined "Marblehead" and "St. Louis" for a cable cutting incursion into Guantanamo Bay. While "St. Louis" dragged for and cut the three cables, "Yankee" and "Marblehead" covered her activities by engaging the Spanish gunboats "Alvarado" and "Sandoval". After putting the Spanish gunboats to flight, the two American warships turned their attention toward the fort at Caimanera which had been making a nuisance of itself with its single large-caliber gun—a venerable, smooth-bore muzzleloader. As "Yankee" and "Marblehead" silenced their last adversary, "St. Louis" completed her cable-cutting mission; and the three ships exited the bay.