In 1519, Hernán Cortés landed on Mexico's east coast with about five hundred Spanish soldiers and a plan to conquer an empire of roughly half a million Aztecs — fierce warriors known to eat prisoners' flesh and wear their skins.1
The odds are the least interesting part of the story. The interesting part is what Cortés identified as his actual problem, which wasn't the Aztecs at all.
His men kept thinking about the ships in the harbor.
This is Robert Greene's central case for Strategy 4, the Death-Ground Strategy — and one of the most cited stories in all of strategic literature, usually told with more admiration than scrutiny.
Cortés had reached Mexico by slipping out of Cuba in the middle of the night with eleven ships, dodging a governor who'd developed second thoughts about sending him.1 Among his five hundred men were loyalists planted by that governor specifically to make trouble if Cortés exceeded his authority.
Those men spread rumors he was insane — an accusation that landed easily, given the plan. A rational man, they argued, would take the gold already collected, sail back to Cuba, and return later with a real army. Why stay in a disease-ridden, uncomfortable country where you're outnumbered a thousand to one, when farms and wives and the good life were waiting across the water?1
On July 30, a sailor woke Cortés begging for mercy and confessed: he'd joined a plot to steal a ship and sail for Cuba that very night, where the conspirators would expose Cortés's plan to conquer Mexico on his own.1
Cortés recognized this as the expedition's decisive moment. He could crush this particular conspiracy easily — but there would be others, because the underlying condition producing them hadn't changed. His men's minds were on gold, on Cuba, on their families. Anything except fighting Aztecs.
He hanged the two ringleaders. Then he did the thing the story is remembered for: he bribed his pilots to bore holes in all the ships and announce that worms had eaten through the boards, making the vessels unseaworthy.1
Pretending to be upset at the news, Cortés ordered everything salvageable brought ashore and the hulls sunk. But the pilots hadn't bored enough holes — only five ships went down. The men accepted the worm story for those five. When a few days later more ships ran aground and only one was left afloat, it became obvious to everyone that Cortés had arranged the entire thing.1
He called a meeting. The mood was, in Greene's word, murderous.
Cortés dropped the pretense entirely. He was responsible, he admitted; he had ordered it done. But there was no turning back now. They could hang him if they liked — and then they'd be surrounded by hostile Indians, with no ships, divided and leaderless, and they would die.1
The only alternative was to follow him to Tenochtitlán. Only by conquering the Aztecs, by becoming lords of Mexico, could they get back to Cuba alive at all. To reach the Aztec capital they'd have to fight with total intensity and total unity — any dissension meant defeat and a terrible death. And since the army was so small, the glory and riches would be proportionally greater.
Then he made the offer that closed it: any coward not up to the challenge could take the one remaining ship and sail home.1
Nobody accepted. The last ship was run aground.
Over the following months, Cortés kept his army away from Veracruz and the coast entirely. Their attention went to Tenochtitlán, the heart of the empire. The grumbling stopped. The self-interest and greed that had divided them stopped. Understanding exactly how desperate their situation was, the conquistadors fought ruthlessly.1
Roughly two years after the ships went down, Cortés's army — with the help of Indian allies who hated the Aztecs — laid siege to Tenochtitlán and destroyed the Aztec empire.
Notice how much of the conquest's actual success came from those Indian allies, not from the ship-sinking. Cortés spent months building alliances with local peoples who had their own long-standing grievances against Aztec rule, and those alliances supplied manpower, local knowledge, and logistics that five hundred Spaniards alone could never have provided. The scuttled ships solved a morale and unity problem inside his own camp. They did not, by themselves, produce the military capacity that won the war. Stories about this episode almost always collapse the two, treating the psychological move as though it were the whole strategy — which flatters the drama of the moment and badly misrepresents what actually did the work.
Greene's framing treats this as a masterclass in identifying the real problem: not the enemy, not the odds, but his own men's divided attention, with the ships as the concrete symbol of that division.1 That analysis is genuinely sharp, and the psychological mechanism is real.
But it's worth stating plainly what the story is also describing. Cortés destroyed the escape route of five hundred people who had not agreed to being trapped, using a deliberate deception (the worm story) that only failed because his pilots did an incomplete job. The men who fought so ruthlessly afterward did so because a single person had unilaterally removed their ability to choose otherwise.
Greene notes the coercion in passing and moves on to the lesson. The lesson — burn your own ships, remove your own fallback — is a self-discipline technique and a genuinely useful one. Cortés's version was something else: manufactured desperation imposed on people with less power than him. The chapter runs both meanings together without ever marking where one ends and the other begins.
You're leading a team that's been half-committed to a difficult project for months — technically working on it, but with everyone's attention partly reserved for the other initiatives they could fall back to if this one gets quietly shelved.
The Cortés diagnosis is available to you and it's genuinely useful: identify the fallback. Usually it's specific and nameable — the parallel project, the assumption that leadership will pull the plug before anyone's reputation is on the line, the unstated belief that this deadline is soft like the last three.
The Cortés method is not available to you, and you should be clear-eyed about why. Removing your team's options without telling them is exactly what he did, and it worked, and it also meant five hundred people bore a risk they'd never agreed to. The version that respects the people involved looks different: name the fallback out loud, make the stakes genuinely clear, and let people opt out honestly if they want to — the one thing Cortés offered at the very end, after he'd already removed the real choice.
What you're aiming for is the psychological effect (undivided attention) achieved through transparency rather than through the destruction of other people's exits.
One clean check: could you describe what you've done, in full, to the people it affects, and have them agree it was fair? Cortés fails this test decisively — his entire method depended on the men not knowing until it was already irreversible. A public deadline you announce, a scope you commit to openly, a resource you visibly reallocate: all pass. The technique isn't the problem. Concealment is what turns a commitment device into a trap.
The scuttling of Cortés's ships is well-documented historically, though the specific details (the bored holes, the worm story, the exact speech) come through Spanish chroniclers writing with obvious interest in presenting Cortés as a decisive genius rather than a reckless gambler who got lucky. [POPULAR SOURCE] for Greene's framing.
The popular phrase "burned his ships" is itself a distortion — the ships were scuttled and run aground, not burned, and the burning version is a later dramatic embellishment that has almost entirely replaced the actual event in common retelling.
Open tension the chapter doesn't touch: the conquest that followed involved the destruction of a civilization and the deaths of enormous numbers of people who appear in this story only as the obstacle Cortés's men needed motivation to overcome. Greene's chapter is about a psychological technique, and on those terms the analysis holds. But the case selected to demonstrate it is a genocide's opening move, and the book presents it purely as an instructive example of clear strategic thinking.
Set this beside Dostoyevsky's Mock Execution, the chapter's other central case. Both men ended up on death ground and both were transformed by it. The difference is who did the arranging: Cortés imposed it on others; Dostoyevsky had it imposed on him by a czar performing cruelty as theater. Greene treats both as illustrations of the same mechanism, and mechanically they are. But reading them together surfaces what the chapter never says directly — every single one of its examples involves someone's options being removed, and in only some of those cases did the person losing their options consent to it. The strategy's ethics change completely depending on which side of that line you're standing on, and the book leaves that entirely to the reader to notice.
Psychology → Commitment Devices. Behavioral economics studies "commitment devices" — arrangements people voluntarily enter to constrain their own future choices, from locked savings accounts to apps that donate to charities you hate if you miss a goal. The insight the pairing produces: the entire modern literature on commitment devices is essentially Cortés's mechanism, minus the coercion — same psychological principle (removing an exit changes present behavior), applied only to oneself, with consent built in as the defining feature. That contrast makes visible exactly what's ethically load-bearing in Greene's story: not the ship-sinking, but who chose it.
Business → Founders Who Burn the Boats for Their Employees. A founder who quits their job, spends their savings, and goes all-in is running a legitimate commitment device on themselves. A founder who structures compensation, equity cliffs, or public commitments so that employees have no realistic exit is running Cortés's version. The insight: these two are frequently praised in identical language ("all-in," "no plan B," "burning the boats"), which obscures the fact that one is self-discipline and the other is a transfer of risk onto people with less information and less power than the person making the decision.
Cortés correctly identified that his problem wasn't the enemy in front of him but the escape route behind him — a genuinely brilliant piece of diagnosis. He then solved it by taking away five hundred other people's ability to choose. The technique and the ethics come apart cleanly here, and most retellings of this story quietly keep the first while never mentioning the second.