9 references to "four":
while government expenses for broken chariots, worn-out hors... ss. 2.13, Chapter 2: Waging War
Indirect tactics, efficiently applied, are inexhaustible as ... ss. 5.6, Chapter 5: Energy
When he utilizes combined energy, his fighting men become as... ss. 5.22, Chapter 5: Energy
the four seasons make way for each other in turn. ss. 6.34, Chapter 6: Weak Points and Strong
These are the four useful branches of military knowledge ss. 9.10, Chapter 9: The Army on the March
which enabled the Yellow Emperor to vanquish four several so... ss. 9.10, Chapter 9: The Army on the March
When there are means of communication on all four sides, the... ss. 11.43, Chapter 11: The Nine Situations
To be ignored of any one of the following four or five princ... ss. 11.53, Chapter 11: The Nine Situations
for these four are all days of rising wind. ss. 12.4, Chapter 12: The Attack by Fire