Sadashige Imanishi's voice falters as he recalls the piles of weapons left behind by dead Japanese soldiers in the jungles of New Guinea.
"That was the first time I thought of them and realized how cruel the war was," Imanishi, a member of the 144th regiment of the Imperial Japanese Army, says before asking the camera to stop filming.
Imanishi, who died last year at the age of 91, plays a central role in a new documentary that for the first time tells of the savage fighting between Japanese and Australian forces during World War II from both perspectives.