Those who planned the secret mission to get Usama bin Laden in Pakistan knew it was a one-shot deal, and it nearly went terribly wrong.

The U.S. deliberately hid the operation from Pakistan, and predicted that national outrage over the breach of Pakistani sovereignty would make it impossible to try again if the raid on bin Laden’s suspected redoubt came up dry.

Once the raiders reached their target, things started to go awry almost immediately, officials briefed on the operation said.

Adding exclusive new details to the account of the assault on bin Laden’s hideout, officials described just how the SEAL raiders loudly ditched a foundering helicopter right outside bin Laden’s door, ruining the plan for a surprise assault. That forced them to abandon plans to run a squeeze play on bin Laden — simultaneously entering the house stealthily from the roof and the ground floor.

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