I think i'd vote for Vietnams effort in fighting, and eventually defeating, France, and the U.S.A. [the most advanced industrial nation in world,] over thirty years of almost non stop fighting, and finally freeing their country from colonial rule and outside interference.
They could certainly go the distance.
The victory had been at a terrible cost, with casualites running into millions, [civilian and military] and the country largely destroyed by over three times the amount of bombs dropped throughout the whole of the Second World War, [which worked out at approximately 1000 lbs. for every man, woman and child living in Vietnam].
Not many great battles, or famous victories [Dien Bien Phu was small compared to other battles, but it Broke the French] but their will to win, staying power, and the guerilla tactics employed by General Vo Nguyen Giap, in the end, won the war against advanced military powers.
It must be one of the most impressive military achievements in the 20th Century.
A FEW VIETNAM WAR STATISTICS
Longest war in US history (11 years)
"War" was never officially declared by the United States
A Cornell University study placed the over-all total U.S. cost
of the Vietnam war at $200 Billion
Total U.S. bomb tonnage dropped during:
World War II = 2,057,244 tons
Vietnam War = 7,078,032 tons (3-1/2 times WWII
tonnage)
Bomb tonnage dropped during the Vietnam War amounted to
1,000 lbs. for every man, woman and child in Vietnam.
An estimated 3 million people were killed by the war,
and over 1 million were wounded.
2,594,000 U.S. personnel served within the borders of South Vietnam (Jan.1, 1965 - March 28, 1973).
U.S. Casualties were 361,887. Missing in Action 2,338.
USMC had more casualties in Vietnam than in WWII! 101,000 vs. 91,000.