In a quiet Shanghai mansion, voices united to create a song that stirred a nation's soul amid WWII – "March of the Volunteers." Across oceans, an American legend sang it in perfect Chinese, spreading resilience beyond borders. Behind the melody and lyrics lies a story of unwavering will. CGTN's feature "The Main Eastern Battlefield: China in WWII" unveils the origin of China's anthem and the enduring spirit it continues to ignite today.