June 12 in Military History — On This Day

Battle of Okehazama

Imagawa Yoshimoto marched roughly 25,000 men through Owari on his way to Kyoto, expecting to brush aside a minor local lord. Oda Nobunaga had perhaps 3,000. He read a scout's report that Yoshimoto had stopped to rest and celebrate in a narrow wooded gorge at Okehazama, moved his whole force through a sudden thunderstorm to approach undetected, and hit the Imagawa camp at the moment least ready for it. Yoshimoto was killed before he understood he was under serious attack.

The battle that made Nobunaga's career and, with it, plausible the idea that Japan's endless civil war might end in someone's total victory rather than another stalemate. An unfashionable minor daimyō with a fraction of the men had killed one of the most powerful lords in the country in an afternoon. Nobunaga spent the next two decades applying the same principle at larger scale: speed, surprise, and a willingness to gamble everything on a single stroke.

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The Fall of Hanseong

King Seonjo abandoned the capital and fled north toward the Chinese border. The Japanese entered Seoul twenty days after landing at Busan and found much of it already burning — set alight by its own people, who had broken into the palaces and burned the slave registries and the archives before the enemy arrived.

The speed is the story: 450 kilometres in three weeks against a state that had been at peace for two hundred years. But the burning of the slave registers by Koreans, before any Japanese soldier arrived, says something else — the dynasty had lost its people's loyalty before it lost its capital. Seonjo's flight nearly ended the Joseon dynasty then and there, and he was still considering crossing into China when the news came from the sea.

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⚔️📍 London, England1944

First V-1 Flying Bombs Hit London

Germany launched its first V-1 flying bomb (Vergeltungswaffe 1) attacks on London, targeting the civilian population with the world's first operational cruise missile. The weapons killed 6,184 civilians and injured 17,981 more.

The V-1 attacks began Germany's 'vengeance weapon' campaign that terrorized British civilians and consumed enormous Allied resources to counter — representing the dawn of precision missile warfare.

Outcome

6,184 killed; massive Allied effort required to defeat campaign