They retreat into the city and continue to prevent the invaders from advancing beyond the gates .
The Chinese forces fight bravely on the frontline , holding off wave after wave of Japanese troops outside Changde until all the external defences have fallen .
defences retreat into the city and continue to prevent the invaders from advancing beyond the gates .
The Chinese forces fight bravely on the frontline , holding off wave after wave of Japanese troops outside Changde until all the external defences have fallen .