It had been planned for weeks but in the end, even the coup plotters were taken by surprise.
The some 300 putschists had heard that the Turkish Government was about to issue arrest warrants for soldiers accused of supporting Fethullah Gulen, an Islamist cleric and longtime foe of President Recep Tayyip Erdogan, who lives in self-imposed exile in the US. So, they advanced their plans to Saturday in what would turn out to be a doomed attempt to catch the Government before it caught them.
While the Government has been keen to suggest a small band of low-ranking dissenters were behind the coup, a new report and the released names of military figures linked to the plot suggests it ran much deeper.
Akin Ozturk, the man thought to have been the mastermind, is a former Air Forces commander and Turkish Supreme Military Council (YAA) member.
He led a group which included the president's own top military adviser, the commander of the main air base used by US troops to launch air strikes against Isis (Islamic State) in Syria, and the commander of the powerful Second Army.