From 1938 to 1943, the Japanese army launched relentless air raids on Changde in central China, killing more than 2,600 civilians. But bombs weren't their only weapon. In clear violation of the Geneva Convention, the invading forces also released plague bacteria, triggering what survivors later called a "silent war" that lasted nearly two years and left thousands more dead. CGTN's Huang Fei looks back at the harrowing stories and meets the families and lawyers still seeking justice.