Anchor rider John Whitaker, 68, who has been on more than 180 Nations Cup squads in his remarkable career, clinched the victory for the team.
Team Great Britain
Eventing Dressage day proved exciting as two riders broke the Olympic record score set in 2000 by David O’Connor and Custom Made.
It was a rough start to the week for Charlotte Dujardin, whose horse and baby girl were both sick, but she led her team to the win.
An all-female squad breezed to golden team glory once again, and also captured individual gold and silver at Haras du Pin.
In this final leg of the series, an all-female British team led the way, ahead of New Zealand, France and Germany.
As the World Eventing Championships dressage wrapped up in Pratoni, the German rider snagged the individual lead ahead of cross-country day.
Great Britain moves into the overnight lead with strong performances on a blustery dressage day that some horses found a bit too exciting.
France finished second with 10 faults, Norway was third with 21 and the Swiss slotted into fourth with an uncharacteristic 25.
Eventing fans at the FEI World Equestrian Games Tryon 2018 were treated to one of the most thrilling afternoons of sport.