Forces News has heard how three Queen's Dragoon Guards troopers tended to casualties during the mass shooting in Las Vegas.
Trooper Woodward, Trooper Finlay and Trooper May tried to help four people who were injured when a man opened fire on a country music festival.
One of the victims they tended to sadly later died.
Personnel from the Welsh Cavalry were on the scene as they were on R&R in Las Vegas following an exercise in Nevada.
An Army spokesperson said:
“We can confirm that a number of serving personnel from 1st The Queen’s Dragoon Guards provided assistance to the wounded following the heinous shooting in Las Vegas. Our thoughts go out to those affected by this terrible act.”
The statement went on to say that three members of the Royal Armoured Corps were involved in the immediate treatment of casualties and the subsequent handover of the wounded to the Las Vegas emergency services.
59 people have been killed and another 515 were hurt after a gunman opened fire on fans at a country music festival. The attack is the worst mass shooting in recent US history.
US SWAT teams who stormed the gunman's room on the 32nd floor of the Mandalay Bay Hotel and Casino skyscraper found he had killed himself after shooting at people at the Route 91 Harvest Festival.
Police shut down busy Las Vegas Boulevard, and federal and state authorities converged on the scene of the attack. Interstate 15 was briefly closed, and flights at McCarran International Airport were suspended.
Hospital emergency rooms were filled with the wounded. Ruben Kihuen, a Democrat whose congressional district includes a portion of Las Vegas, visited a hospital were some of the victims were taken and said:
"Literally, every single bed was being used, every single hallway was being used. Every single person there was trying to save a life."
The dead included at least three off-duty police officers from various departments who were attending the concert, authorities said. Two on-duty officers were wounded, one critically, police said.
Nearly every inch of the Las Vegas Strip is under video surveillance, much of it set up by the casinos to monitor their properties, which could yield a wealth of material for investigators as they try to piece together the attack.
Before Sunday's massacre, the deadliest mass shooting in modern US history took place in June 2016, when a gunman who professed support for Muslim extremist groups opened fire at a gay nightclub in Orlando, Florida, killing 49 people.