[2] Johnson said 'Guo stressed that from a Marxist–Leninist perspective the notion of "not fighting and subduing the enemy"'—the core of the conventional interpretation of Sun Zi—was un-Marxist, since class enemies could not be credibly defeated without the application of violence.

'[1] Around June 4, 1937, Guo was the dean of studies of Qingyang Infantry School.

[3] Guo wrote A Preliminary Study of Sun Tzu's Art of War (T: 孫子兵法初步研究, S: 孙子兵法初步研究, P: Sūnzǐ Bīngfǎ Chūbù Yánjiū), which was completed in 1939.

The book says "The position Kuo has now enjoyed as a leading military theoretician seems to date from that period.

"[2] By 1971, Guo's latest edition of The Art of War was A Modern Translation with New Chapter Arrangement of Sun Tzu's ʻArt of Warʼ (T: 今譯新編孫子兵法, S: 今译新编孙子兵法, P: Jīnyì Xīn Biān Sūnzǐ Bīngfǎ).