Editing Corregidor (section)

===American colonial period===
[[Image:Malinta Tunnel.JPG|thumb|250px|The entrance to [[Malinta Tunnel]]]]
In 1902, the island was organized as an American [[military reservation]]. In 1903, a convalescent hospital was established by the [[United States Army|U.S. Army]].

The [[Board of Fortifications]] chaired by [[William H. Taft]] recommended that key harbors of territories acquired after the [[Spanish–American War]] be fortified.<ref>McGovern, pp. 8</ref> Consequently, Corregidor was fortified and incorporated into the [[Harbor Defenses of Manila and Subic Bays|harbor defenses Manila and Subic Bays]]. In 1908, a Regular Army post was established on the island, designated as [[Fort Mills]], in honor of Brigadier General [[Samuel Meyers Mills, Jr.]], Chief of Artillery of the U.S. Army from 1905 to 1906. By early 1909, H Company of the 2nd Battalion of the [[United States Army Corps of Engineers|Corps of Engineers]] was assigned to Corregidor and started on the construction of concrete emplacements, bomb-proof shelters, and trails at various parts of the island. This pioneer engineer company left Fort Mills on March 15, 1912. All or part of 35 different numbered [[Coast Artillery Corps]] companies served tours at Fort Mills between 1909 and 1923.

The defense of Corregidor was the immediate responsibility of the Philippine Coast Artillery Command, commanded by Major General George F. Moore at the start of World War II. Stationed on the island after the return to the regimental system in 1924 were the following regular units:
* [[59th Coast Artillery Regiment (United States)|59th Coast Artillery]] (U.S. Regular Army)
* [[60th Coast Artillery (United States)|60th Coast Artillery]] AA (U.S. [[Regular Army (United States)|Regular Army]])
* [[91st Coast Artillery (United States)|91st Coast Artillery]] ([[Philippine Scouts]])
* [[92nd Coast Artillery (United States)|92nd Coast Artillery]] (Tractor Drawn) (Philippine Scouts)
* Headquarters, [[Harbor Defenses of Manila and Subic Bays]] and the Seaward Defense Command.

In addition to [[Fort Mills]]; the army post on [[Caballo Island]] was named [[Fort Hughes]]; on [[Fort Drum (El Fraile Island)|El Fraile]], Fort Drum; and on Carabao Island, [[Fort Frank]]. According to the war plan, these forts could withstand a six-month-long siege, after which the [[United States]] would provide aid. The fortifications on Corregidor were designed solely to withstand seaborne attack. Though American military planners realized that airplanes would render Fort Mills obsolete, the United States was restricted from improving the fortifications by the [[Washington Naval Treaty]] of 1922. In 1932–1934, the U.S. Army constructed the [[Malinta Tunnel]], with its series of related laterals, to protect its military stores and vital installations in the event of war.

Fort Mills's defense installations had cost the [[Federal government of the United States|U.S. government]] more than $150&nbsp;million, which did not include the expense of fortifying the neighboring islands of Caballo, Carabao, and El Fraile.

====Infrastructure====
There were {{convert|65|mi|km|0}} of paved roads and trails on the island and {{convert|19.5|mi|km|1}} of electric railroad track. The latter were used largely to haul heavy equipment and ammunition from Bottomside to the different Batteries. The Corregidor High School was where children of both Filipino and American servicemen assigned on the island studied. The island also had an electric trolley system as public transport, a movie house (Cine Corregidor), a baseball field and a swimming pool. The business and social center of this community was found on Topside.

====Water supply====
Before the war and during the siege, Corregidor depended on Bataan for most of its potable water. For this purpose, barges were used to haul water either from [[Mariveles, Bataan|Mariveles]] or Cabcaben, Bataan.