徐州会戦
Wong filmed more newsreels covering Japanese attacks in China, including the Battle of Xuzhou in May 1938 and aerial bombings in Guangzhou in June. At times, he placed himself in danger to get a photo; once was subjected to bombing and strafing by Japanese aircraft. After angering the Japanese by documenting the violence of their attacks, the Japanese government put a bounty of $50,000 on his head. In China, he operated under British protection, but continued death threats from Japanese nationalists drove him to leave Shanghai with his family and to relocate to Hong Kong.