While walking through the modern metropolis of Shanghai, Benjamin Miller, an international student from the UK, was once struck by a question: why was there a wall riddled with bullet holes in the city center? This "bullet-riddled wall" is the western facade of the Sihang Warehouse Memorial Hall, which witnessed how Lieutenant Colonel Xie Jinyuan led around 420 soldiers to fight against the invading Japanese forces in 1937. Click the video and find out his soul-searching journey to the past.