Corregidor was taken back by the marines who pour gas down the ventilation shafts and set the Japanese on fire.
Do the same to any ISIS Holes found.
I want to correct the post. It was army and naval forces who created the bonfire.
Excerpt: On April 5 a series of pipes were brought to the slopes and hooked up to a pump on a Landing Craft, Mechanized (LCM) attached to two Navy pontoons known as cubes that contained the fuel oil and gasoline. The device became known as the “Rube Goldberg.” Division engineers of the 113th Engineer Battalion linked the sections of pipes with flexible joints running up from the pumps on the LCM to the top of the hill. After first successfully testing the device with seawater, the “Rube Goldberg” was declared ready to be put to good use. A mixture of more than 2600 gallons of diesel oil and gasoline was pumped from the LCM into the mortar puts near the entrance to the tunnels. When the pontoons were empty, the infantry lobbed white phosphorus (WP) mortar shells into the pits. According to the official 38th Division after-action report, “the results were most gratifying.” A tremendous volume of flame erupted from the pit followed by a secondary explosion as small arms munitions began to cook off. There were seven subsequent explosions. A previously unknown drain cover blew out of the hillside and some of the fuel escaped and burned on the North Beach.
http://www.johnshively.com/Articles/Retaking%20Fortified%20Islands%20of%20Manila%20Bay.html
Another article with photos.
Excerpt: The fort burned for two weeks and no Japanese prisoners were taken, only 68 body remnants recovered.
http://laststandonzombieisland.com/tag/corregidor/