Luckily for him, a herder appeared on a motorcycle and three hours later had retrieved Dampier-Crossley's Mongolian pony from 6km away on the side of a nearby mountain.
Reunited with all his gear, the bruised and battered Dampier-Crossley continued on the longest and toughest horse race on earth.
The Mongol Derby is a 10-day adventure race for equestrians racing over 1000km across the barren steppes of Mongolia.
Part of the Equestrianists world series of distance races, it was run in two events in 2022, to make up for earlier Covid cancellations.
One race was held in July and the second in August, the one Dampier-Crossley and his younger brother Ben entered.
"I read about it 12 years ago but life on the farm and family had put it on hold until I turned 40, two years ago. I applied this year and managed to convince Ben to enter as well.
"We were lucky to be two of the 46 competitors selected from over 400 entries worldwide, to take part in the race."
On August 7, after 50 hours of travel, the brothers fronted up at the race headquarters in Ulaanbaatar, Mongolia, to enter the race.
"We were all weighed in and medically checked over. You had to weigh a maximum of 85kg wearing all your riding gear of boots, jackets, pants, helmet and backpack."
The horse's saddle, reins, straps, water, and the important emergency and communications gear were all judged as free weight.
"We then had to find out how the comms and GPS gear all worked. We then boarded a bus for a six-hour drive west of Ulaanbaatar to the start of the race."
There, awaiting the competitors, was a replica of a section of Genghis Khan's mighty horse messenger system, which at the time connected half the planet.
"We would ride for up to 10 days continuously, from 7 am to 7 pm, making our way along a network of 27 horse stations spaced about 35km apart.
"At each one, you changed horses and continued on to the next horse station, just like they did in the old days.
"At each station, vets assessed the horses we had just ridden in on, to make sure they were OK before we were allowed to continue.
"In all, you would ride 28 Mongolian ponies, some of the feistiest and strongest horses in the world.
"They were only between 12 and 14 hands high but they all had massive stamina and could run all day."
But it was almost like a lottery as to which one you got at each station.
"We quickly learned the fatter ones were slower but the rest were fast and hardy horses.
"Some bucked, others didn't, some went fast in the wrong directions and others were awesome little horses."
Dampier-Crossley said each night, riders chose to either stay at the stations or camp out under the stars, as he did a couple of times.
"Mostly when 7 pm rolled around, I would look for a nearby Ger or Mongolian herders iconic hut, and knock on the door asking them if I could stay and rest my horse until tomorrow.
"The Mongolian herders were lovely people, no one ever said no and they took great care of us all."
In all he spent eight long days in the saddle, initially riding in a group of four but when two were brought down by the minefield of Marmot and fox holes out on the steppes he was soon on his own.
"Those long days of mustering prepared me well for the mental task of riding in a place that resembles the McKenzie, but is many, many times bigger and very empty."
Only 26 finished out of the 46, and that included his brother Ben.
Dampier-Crossley earned 6th overall while Ben was 8th.
"The marmot holes took out many riders, and a norovirus meant it wasn't fun for a while.
"This is such a hard race that right up until the last day I didn't know if I was ever going to finish it or not."
That last day was one of the best, Dampier-Crossley said.
He caught up with another rider and the pair raced each other to the finish line completing almost 1300km in eight days.
