On Guerrilla Warfare (simplified Chinese: 论游击战; traditional Chinese: 論游擊戰; pinyin: Lùn Yóujĩ Zhàn) is Mao Zedong’s case for the extensive use of an irregular form of warfare in which small groups of combatants use mobile military tactics in the forms of ambushes and raids to combat a larger and less mobile formal army. Mao wrote the book in 1937 to convince Chinese political and military leaders that guerilla style-tactics were necessary for the Chinese to use in the Second Sino-Japanese War.