Around 800 military personnel from Commando Training Centre Royal Marines have been speed marching through Exmouth and Lympstone in Devon.
The unit was accompanied by six runners who have travelled around Europe raising hundreds of thousands of pounds for Royal Marines' charities.
The event was held as part of the Corps of Her Majesty's Royal Marines 350th anniversary celebrations.
It was a booted run recreating techniques used during World War Two.
The speed march started on the Exmouth seafront at 10:45 BST. It was led by drummers from the Royal Marines Band.
The team of six runners, who joined the speed march were from the 1664 Challenge, which was set up as part of the anniversary celebrations.
They started their journey in Norway on 5 February.
The challenge has seen the six marines ski, sail, cycle, canoe and run 6,656 km (4,136 miles).
WO1 Phil Gilby, the Regimental Sergeant Major of the training centre, said: "This is probably the most military people who have ever gone through Exmouth, including during the Second World War."
"The Commando Training Centre works hard to foster our links with Exmouth, Exeter and Lympstone.
"We hope this event will bring our ties even closer with the local communities whose support to the 1664 Challenge is essential."