Incredible photos from the Korean War campaign that showed what the US Marine Corps is made of

During the pivotal battle, which lasted from late November to mid-December of 1950, 15,000 US soldiers and Marines, alongside another 15,000 UN soldiers, fought through a force of 120,000 Chinese soldiers to reach the sea some 78 miles away.

During the campaign, US forces successfully evacuated 98,000 refugees while inflicting heavy losses on the Chinese army.

The Marine Corps led the push against a numerically superior Chinese force. They broke through an enemy encirclement, and even rebuilt a bridge that the Chinese had destroyed.

In the process, they also saved the UN's army in Korea from total defeat.

The campaign is one of the defining events of the Marine Corp's modern history, but it remains largely unknown outside of military and historical circles.

In 2014, Marine Corps veterans Brian Iglesias and Anton Sattler have released an award-winning documentary, CHOSIN, that details the operation and includes interviews with veterans from the battle.

Here's a look at one of the pivotal campaigns of the Korean War, and one of the US Marine Corps' finest hours.