The garrison at 赤坂城 (Akasaka Castle) had every reason to be alert. It was the spring of 1332, and the mountains of 河内国 (Kawachi Province) were full of loyalist sympathizers, irregular fighters, and men who served an emperor that the Kamakura shogunate had sent into exile. A garrison holding a captured castle in hostile country is supposed to be suspicious of everything.

They were not suspicious enough.

When the supply convoy came up the road on April 28, the garrison watched it carefully — a column of porters and convoy guards moving with the ordinary slowness of men carrying heavy loads. Then, as the convoy approached the gates, a group of armed men burst from the tree line and attacked it. The guards scrambled. The porters panicked. The garrison commander, watching an ambush on the shogunate's supply column right outside his walls, opened the gates to let the convoy's escorts rush inside for safety.

The escorts drew weapons from the supply bags and cut him down.

楠木正成 (Kusunoki Masashige) had designed the entire scene. Half his force had dressed as supply workers; the other half staged the mock attack in plain view of the walls, knowing the garrison would react exactly the way frightened men always react — by opening the door. Once the disguised troops were inside, those on the outside struck simultaneously. 湯浅 (Yuasa), the garrison commander, surrendered after a brief fight. 赤坂城 (Akasaka Castle) — the same fortress the Kamakura shogunate had seized from Masashige just five months before — was back in loyalist hands before the sun set.

To understand what makes this moment more than a clever anecdote, you have to understand who Masashige was, and who he was fighting.

The Kamakura shogunate, by 1332, had governed Japan for over a century. It was not a regime that feared minor lords from obscure provinces. Emperor 後醍醐 (Go-Daigo) had spent years attempting to reclaim imperial authority — actual authority, not ceremonial — and the shogunate had exiled him for it. What the shogunate could not do was root out every loyalist commander in every mountain range in Japan, and Masashige had made himself the most elusive of them all.

His origin in the Emperor's service is one of the stranger episodes of the period. Before Go-Daigo knew Masashige existed, the Emperor had a dream: he sheltered under a great camphor tree (楠, kusunoki) in the south of a wide courtyard. When he woke, he sent messengers looking for anyone whose name contained the character for camphor. A minor lord from 河内国 (Kawachi Province) whose family name was 楠木 (Kusunoki) — literally "camphor tree" — was summoned. This is how an obscure warrior without a powerful clan or a distinguished lineage became the most trusted military commander of the imperial restoration.

Masashige had already demonstrated his character during the first 赤坂城 (Akasaka Castle) siege in November 1331. His fortress was tiny, his garrison outnumbered massively by the shogunate forces. Rather than die in a hopeless last stand, he arranged a dramatic-looking fire, let the shogunate assume he had perished in the burning castle, and slipped away with his surviving men. He spent the following months in the mountains, recruiting, planning, watching. When the moment was right, he came back — not with a larger army, because he still did not have one, but with a better idea.

The chronicle of this period, the 太平記 (Taiheiki), records the details of the supply convoy ruse: weapons concealed in cargo bags, the staged attack, the opened gates. The Taiheiki is a literary chronicle written decades after the events and known to embellish; historians treat its specific tactical details with some caution. But the core of the story — surprise recapture of 赤坂城 (Akasaka Castle) in April 1332 through deception, not force — is confirmed independently. Masashige won because he thought past the wall.

The recapture of 赤坂城 (Akasaka Castle) was not the end of his story. It was the opening statement. In 1333, at 千早城 (Chihaya Castle), he would hold a nearly impregnable mountain fortress against a shogunate army that vastly outnumbered his own, using a series of traps, tricks, and improvised defenses that tied down the enemy for weeks — long enough for 足利尊氏 (Ashikaga Takauji) to defect to the Emperor's side and for the Kamakura shogunate to collapse entirely. Masashige's guerrilla campaign had bought exactly the time the restoration needed.

He lived long enough to see the Kamakura shogunate destroyed. He did not live long enough to see what replaced it hold together. When the Kenmu Restoration faltered and Ashikaga Takauji turned against Emperor Go-Daigo, Masashige advised the Emperor honestly: the battle at 湊川 (Minatogawa) in 1336 was unwinnable. Go-Daigo ordered it anyway. Masashige fought it anyway, leading 700 horsemen against a vastly larger force, watching his numbers dwindle — 500, then 300, then 73 — until there was nothing left to do but dismount and die. According to legend, his last words to his brother 正季 (Masasue) were: "七生報國 (Shichisho Hokoku) — Would that I had seven lives to give for my country."

Masashige never flinched from a situation that was already lost. That quality — first demonstrated with a bag of hidden weapons outside a mountain castle in 1332 — made him the most revered samurai of all, not for winning, but for the absolute precision of his loyalty.