"It is, I believe, the most self-restrained, self-disciplined army in the world," said U.S. Marine officer Evans Carlson who trekked thousands of kilometers with China's Eighth Route Army in 1937-38.

What could impress a battle-hardened Marine that much?

This is Episode 2 of 4 in Seeing Is Believing: The Story of a U.S. Marine Officer Embedded in CPC-led Anti-fascist Forces.

Episode 1: When a U.S. Marine officer decided to "join" China's Eighth Route Army

Stay tuned.