320 mm mortars
... that the Japanese Army used 320 mm mortars to frighten American Marines during the Battle of Iwo Jima?
... that the <a href="./Imperial_Japanese_Army" id="mwAf4" rel="mw:WikiLink" title="Imperial Japanese Army">Japanese Army</a> used <b id="mwAf8"><a class="mw-redirect" href="./320_mm_mortar" id="mwAgA" rel="mw:WikiLink" title="320 mm mortar">320 mm mortars</a></b> to frighten <a class="mw-redirect" href="./US_Marine_Corp" id="mwAgE" rel="mw:WikiLink" title="US Marine Corp">American Marines</a> during the <a href="./Battle_of_Iwo_Jima" id="mwAgI" rel="mw:WikiLink" title="Battle of Iwo Jima">Battle of Iwo Jima</a>?