Situated at the mouth of Subic Bay. on beautiful Grande Island. Fort Wint was ideally located to defend one of the world's great natural harbors against enemy warships.
The Fort's importance was four fold:
(1) protected the Navy's small base and the Dry Dock Dewey at Olongapo.
(2) protected Bataan's back door from enemy naval and amphibious attacks.
(3) prevented enemy forces from using the harbor for a supply base only a few miles from our forces on Bataan, and
(4) provided early warning of enemy ships and aircraft proceeding south towards Bataan and Manila Bay.
Fort Wint originally had five fixed batteries that mounted two 10-inch disappearing, four 6-inch disappearing, and eight rapid fire 3-inch guns as follows:
* Battery Warwick, two 10-inch disappearing guns
* Battery Woodruff, two 6-inch disappearing guns
* Battery Hall, two 6-inch disappearing guns
* Battery Jewell, four 3-inch rapid fire pedestal guns
* Battery Flake, four 3-inch rapid fire pedestal guns
However, a system of controlled mines was originally designed to be the island's primary defense against enemy warships.
In 1919. the two 3-inch guns and carriages in emplacements three and four of Battery Jewell were removed and installed in Battery Hoyle. Fort Frank.
During the 1920s. two guns and their carriages were removed from Battery Flake and moved to Manila Bay. They were never replaced.
Grande Island, the former Harbor Defense Fort, still has many fortifications in place including two 6 inch guns.
Since it's abandonment in WWII it was used by the Navy and is now a resort.
Reference: A Short History of Fort Wint by George Munson (http://corregidor.org/chs_munson/wint.htm)
Reference: Naval Air Station Cubi Point (https://en.wikipedia.org/wiki/Naval_Air_Station_Cubi_Point)
Reference: Fort Wint, Subic Bay
(https://corregidor.proboards.com/thread/987/fort-wint-subic-bay)