发行时间：2022.01.22
总页数：6
编辑：
综保科技
摘要：
the subterranean combined arms fight: a primer
cpt michael duffy
the subterranean fight is one that has affected soldiers since early warfare. caves were used as hiding places. tunnels were frequently dug under medieval castles to try and bring down walls (“sapping”), leading to countertunneling operations and underground fighting. indeed, this is where the term “sappers” originated. tunnels were frequent hiding places and hospitals during the civil war, most notably during the siege of vicksbur...
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