I've done a bit of serious research over the years and have come to the conclusion that, had the Japanese invasion of that embattled island at the mouth of Manila Bay been hurled back into the sea, then perhaps 50% of the island's artillery could have been brought back into service, had they been given but a few day's respite from the constant Japanese artillery bombardment.
Only problem was, the fortified islands had but a month's worth of food supplies left at half rations for the garrison and they were running low on drinking water because of a serious lack of diesel fuel to run their water pumps. What say you guy and gal historians?
http://corregidor.org/chs_moorerpt/war_damage.htm