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第二次世界大战中,为了给进攻日本扫清障碍,美军决定攻占硫磺岛。为了一举拿下该岛,美军在登陆战之前进行了长达半年的轰炸.但是由于日军的工事隐蔽坚固,这些征轰滥炸收效甚微。1942年2月的一天,硫磺岛登陆战打响了,当美军向岛内推进时,遭到了日军大片地堡群的阻击。这些构筑在熔岩之下的地堡,明暗结合,设置巧妙,美军前进不了一步。指挥官断普鲁斯意识到,正是这些地堡已经浪费了美军上万吨的炸弹。如何才能攻克它们呢?他急忙召集众人商议对策。这时,工程技术人员注意到地堡群山口狭小,想到了一个好方法。
In the Second World War, in order to clear off the obstacles to attack Japan, the U.S. military decided to seize Iwo Jima. In order to win the island in one fell swoop, the U.S. military bombarded the island for as long as six months before the landing battle, but the indiscriminate and indiscriminate use of the Japanese military resulted in little success. One day in February 1942, the Iwo Jima embarkation war started. When the U.S. military advanced to the island, it was stopped by a large group of Japanese bunkers. These bunkers built under the lava, the combination of light and dark, cleverly set, the United States can not move forward. Commanding Officer Prussian realized that it was these bunkers that have wiped out tens of thousands of tons of U.S. bombs. How to overcome them? He hurriedly called the people to discuss countermeasures. At this time, engineers and technicians noticed the crater ridge cramped, think of a good way.