{"id":77502,"date":"2024-12-07T17:12:26","date_gmt":"2024-12-07T17:12:26","guid":{"rendered":"https:\/\/one.sightlinemg.com\/navytimes\/uncategorized\/2024\/12\/07\/the-ordnance-that-made-the-attack-on-pearl-harbor-so-devastating\/"},"modified":"2026-08-08T15:43:36","modified_gmt":"2026-08-08T15:43:36","slug":"the-ordnance-that-made-the-attack-on-pearl-harbor-so-devastating","status":"publish","type":"post","link":"https:\/\/one.sightlinemg.com\/navytimes\/news\/your-navy\/2024\/12\/07\/the-ordnance-that-made-the-attack-on-pearl-harbor-so-devastating\/","title":{"rendered":"The ordnance that made the attack on Pearl Harbor so devastating"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">For their surprise attack at&nbsp;<a href=\"https:\/\/www.militarytimes.com\/veterans\/military-history\/2024\/12\/07\/so-this-is-war-a-young-marines-account-of-days-before-pearl-harbor\/\" target=\"_blank\">Pearl Harbor<\/a>, the Japanese utilized a mix of torpedoes and bombs \u2014 some specially customized for the assault. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By December 1941, the Japanese had refined their \u201cType 91, Modification 2\u2033 torpedo to be extremely reliable. But Pearl Harbor\u2019s shallow 45-foot waters posed a problem: when dropped, a torpedo would typically plunge at least 90 feet before rising to <a href=\"https:\/\/www.militarytimes.com\/veterans\/military-history\/2024\/12\/07\/could-a-young-army-pilot-have-prevented-the-pearl-harbor-tragedy\/\" target=\"_blank\">attack<\/a> depth. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After extensive testing, the Japanese attached wooden tail fins and slipped wooden sheaths over the torpedo\u2019s side anti-roll tabs. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both additions\u2014which increased surface area, added buoyancy and broke away upon impact with the water \u2014 proved decisive. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"782\" src=\"\/wp-content\/uploads\/2026\/08\/ww2-japan-ordnance-pearl-harbor-scaled-2048x782.jpg.jpg\" alt=\"\" class=\"wp-image-108855\" srcset=\"https:\/\/one.sightlinemg.com\/wp-content\/uploads\/2026\/08\/ww2-japan-ordnance-pearl-harbor-scaled-2048x782.jpg.jpg 2048w, https:\/\/one.sightlinemg.com\/wp-content\/uploads\/2026\/08\/ww2-japan-ordnance-pearl-harbor-scaled-2048x782.jpg.jpg?resize=300,115 300w, https:\/\/one.sightlinemg.com\/wp-content\/uploads\/2026\/08\/ww2-japan-ordnance-pearl-harbor-scaled-2048x782.jpg.jpg?resize=768,293 768w, https:\/\/one.sightlinemg.com\/wp-content\/uploads\/2026\/08\/ww2-japan-ordnance-pearl-harbor-scaled-2048x782.jpg.jpg?resize=1024,391 1024w, https:\/\/one.sightlinemg.com\/wp-content\/uploads\/2026\/08\/ww2-japan-ordnance-pearl-harbor-scaled-2048x782.jpg.jpg?resize=1536,587 1536w\" sizes=\"auto, (max-width: 2048px) 100vw, 2048px\" \/><figcaption class=\"wp-element-caption\">(Graphic by Jim Laurier)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Torpedo planes coordinated their assault with aircraft carrying Type 99 anti-ship bombs, which were converted artillery shells. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When dropped from altitude, the streamlined projectiles could pierce steel armor, penetrate through a ship\u2019s decks and explode. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One such bomb caused the massive fatal explosion aboard the&nbsp;<a href=\"https:\/\/www.historynet.com\/uss-bunker-hill-kamikaze-attack-survivor-interview\/\" target=\"_blank\">USS&nbsp;<i>Arizona<\/i><\/a>, killing 1,177 servicemen in seconds. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To strike targets further inland, dive bombers carried the Type 98 general-purpose bomb, wreaking havoc on airfields, structures, vehicles, and parked aircraft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.historynet.com\/type-91-japanese-torpedo-ordnance\/\" target=\"_blank\"><i>This story originally appeared on HistoryNet.com. <\/i><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A brief description of some of the bombs and torpedoes the Japanese used to add devastation to the Dec. 7, 1941 attack.<\/p>\n","protected":false},"author":7,"featured_media":69846,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_canonical":"","_acf":"","_yoast_wpseo_primary_category":65,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_smg_distribution_targets":[]},"categories":[101,87,12,26,19,65],"tags":[],"coauthors":[7036],"class_list":["post-77502","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-daily-news-roundup","category-military-history","category-news","category-newsletters","category-veterans","category-your-navy"],"acf":{"subheadline":"","legacy_arc_id":"2EI4JMAGLRCDPCQSJSMSRN3EZ4","arc_canonical_url":"\/news\/your-military\/2024\/12\/07\/the-ordnance-that-made-the-attack-on-pearl-harbor-so-devastating\/","remove_feature_photo":false,"is_sponsored":false,"subtype":"","redirect_url":"","disable_inline_ads":false,"native_logo_pretext":"Presented 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