The occasion marks the largest scale murder of police at any one time in Australia's history, and is a chance to recognise the 280 NSW Police Force officers who have been killed or injured in the line of duty since 1803.

Commissioner Moroney, along with representatives from NSW Police, hosted a wreath laying ceremony at Braidwood Cemetery, to remember the fallen constables and to reveal the newly restored gravesite.

"Having visited the site in August last year and finding the grave in disrepair, it became a personal priority of mine to ensure the restoration of the site, and to commemorate the fine work of these men so as their memory may be forever preserved in our history," Mr Moroney said.

On the night of 8/9 January, 1867, four Special Constables, John Carroll (aged 38), Patrick Kennagh (26), Eneas McDonnell (50) and John Phegan (30), were in pursuit of members of the Clarke Gang of bushrangers at a property known as Jinden.

The Gang, lead by Thomas Clarke, are believed to have been responsible for the earlier shooting murder of 25-year-old Constable Miles O'Grady on 9 April 1866, at Nerringundah, west of Bodalla.

Historical reports reveal the four Special Constables were ambushed by members of the Clarke Gang, resulting in their subsequent shooting murder.

It's believed the bodies were wrapped in bark and buried in a shallow grave on the property. The bodies were exhumed a week later and given an honourable burial at Braidwood Cemetery.

"Their bravery resulted in the eventual arrest, conviction and hanging of the Clarke Gang bushrangers at Darlinghurst Jail in July 1867," Mr Moroney said.

"This occasion was an opportunity to reinforce the proud traditions and history of the NSW Police Force and to honour the contribution of these Special Constables in providing a safer community."

"These four brave officers made an enormous contribution in shaping the NSW Police Force into the proud organisation it is today."

"In order for this organisation to go forward, we must know where we have come from."

The Commissioner is dedicated to ensuring the preservation of police sites and urges anyone with information about sites that may require restoration, to contact Sgt Donna Bruce in the Commissioner's office, on 02 8263 6356.