Synthesized answer
The provided passages do not contain information about the evidence the author provides in "On Protracted War" by Zedong Mao. The passages only include the title, author, and category. Therefore, I cannot answer your question.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: On Protracted War by Zedong Mao Categories: China Pages: 134