Japanese missions against Graciosa Bay on Ndeni Island (Nendo)
August 31, 1942–September 12, 1942

August 31, 1942
(IJN) At 6:15pm I-19 shells Graciosa Bay for ten minutes.

September 12, 1942
(IJN) During the early morning, two Japanese submarine surfaced at the entrance of Graciosa Bay, and commenced firing at USS Mackinac and USS Ballard (their PBY Catalinas were away on missions). Ballard slipped its anchor and proceeded at full speed to find the submarine but it submerged and escaped.

The Pacific Theater: island representations of World War II page 264
"The anticipated Japanese attack finally came. At the time, the aircraft were away on patrol, so the attack was directed toward the ship. The ship fired back, and witnesses believed that the attack was beaten off. There was apparently one casualty: a local boy about five or six years old, who had been paddling about the ship, was struck in the face by a bomb fragment. He made it back to shore and recovered from his injuries, but he lost one eye. Shortly after the attack, the ship weighed anchor and left Graciosa Bay not to return."