It was a sneak attack, but not by the enemy they feared.
U.S. Army Capts. Joshua Lawrence and Drew Russell were inside a small command post on an Afghan army base, wrapping up a long day of coordinating the safe arrival of nearly 100 Afghan religious and tribal leaders for a peace conference at a nearby palace.
Darkness had fallen.
Some of their fellow soldiers had retired for the evening. Two stood guard.
All seemed well.
But as several soldiers sprawled on nearby cots, playing cards, the calm collapsed catastrophically at 9:27 p.m.
An exploding grenade shattered the stillness, followed in seconds by bursts of gunfire. Before any of the Americans could raise a hand to defend themselves, Lawrence was dead from a bullet to the head, and Russell was dying, shot three times in the back.
They were not killed by the Taliban, as the U.S.-led military coalition indicated the day after the Oct. 8, 2011, assault. Lawrence, 29, of Nashville, Tenn., and Russell, 25, of Scotts, Mich., were killed in what U.S. investigators later called a "calculated and coordinated" attack by Afghan soldiers entrusted to work alongside their U.S. partners.
This is the first published account of the attack and is based on internal Army records and interviews in the U.S. and Afghanistan.
For Russell's family, the anguish is still fresh. His father, Jim, said the loss was even harder to accept after learning from the Army's investigation report early this year that it was a supposed ally, not the Taliban, who killed his son.
"It wasn't like a battle, you know. He pretty much got ambushed," he said, pausing at length to settle his emotions. "That makes it difficult."
On that moonlit Saturday evening, Russell was the designated "battle captain," or duty officer, in the command center. Lawrence worked beside him as a plans officer. Both were members of the 4th Infantry Division's 2nd "Warhorse" Brigade. They deployed to Afghanistan in June 2011. Lawrence had married just one week before leaving; the honeymoon was to wait until he returned home.