Tomoyuki Yamashita
When the war with America and Britain started, Tsuji was on the staff of General Tomoyuki Yamashita, whose army invaded Malaya. He was largely responsible for planning Yamashita's successful landing in Malaya and subsequent campaign against Singapore. After the capture of Singapore, Tsuji helped plan the "Sook Ching" – a systematic massacre of thousands of Malayan Chinese who might be hostile to Japan.