An interesting link from a fellow Afghan hand from a US site.
StrategyPage.com - Combat Information Center analysis, facts and figures about military conflicts and leaders
Other military history buffs may have a different opinion which would be interesting to read.
Among the many regiments that have served in the British Army over the centuries is one that holds the dubious distinction of having been wiped out more often than any other in the history of the service, the former 44th Regiment of Foot.
The 44th Foot had its origins in 1741, when one James Long raised a regiment for the British Army. For a time known as the 55th Foot, in 1748 the regiment was redesignated as the 44th, and was later renamed the 44th East Essex. In 1851 the regiment merged with the 56th West Essex Regiment and became the 1st Battalion of the new Essex Regiment.
On four occasions the regiment was virtually obliterated in action.
* Sept. 21, 1745, the Battle of Prestonpans, Second (or maybe Third or Fourth . . . ) Jacobite Rising: Of 291 men present in five companies, some were killed but most were captured, including 13 officers, among them Lt. Col. Sir Peter Halkett, commanding.
* July 9, 1755, the Battle of the Monongahela ("Braddock's Defeat"), French & Indian War: The regiment lost heavily, with many killed, including Col. Halkett and his son, and most of the rest wounded.
* January 13, 1842, Battle of Gandamak, First Anglo-Afghan War: The final battle of the British retreat from Kabul, only one man escaped death or capture, to make it back to India, Surgeon William Brydon; 41 men were subsequently released from captivity
* July 1, 1916, Battle of the Somme, The Great War: In 90 minutes (1050-1220) the 1st Battalion took so many casualties that it was unable to continue in action.
On might also include the Battle of New Orleans (January 8, 1815), where the regiment suffered 36 killed, 162 wounded, and 80 captured, for 278 casualties, not to mention one officer subsequently cashiered. Making matters worse, American observers claimed that the regiment left the field precipitously.
In 1958 the Essex Regiment was amalgamated with another regiment to form the 3rd East Anglian Regiment, which in 1964 became the 3rd Battalion of the Royal Anglian Regiment. In 1992 the regiment was wiped out for the last time, when the battalion was formally disbanded -- sic transit gloria mundi.