He managed to evade the Chinese Communist forces, disguised as a soldier and escaping at night.

CNN: The story

When Chinese Communist Forces viciously attacked friendly elements, Chaplain Kapaun calmly walked through withering enemy fire in order to provide comfort and medical aid to his comrades.

WHITEHOUSE: President Obama to Award Medal of Honor

As Chinese Communist Forces approached the American position, Chaplain Kapaun noticed an injured Chinese officer amongst the wounded and convinced him to negotiate the safe surrender of the American forces.

WHITEHOUSE: President Obama Awards Chaplain Emil Kapaun the Medal of Honor | The White House