There is no place where espionage is not possible.
Carefully compare the opposing army with your own, so that you may know where strength is superabundant and where it is deficient.
Be where your enemy is not.
Hence the saying: One may know how to conquer without being able to do it.
In war, then, let your great object be victory, not lengthy campaigns.
Now an army is exposed to six several calamities, not arising from natural causes, 1 but from faults for which the general is responsible. These are: (1) Flight; (2) insubordination; (3) collapse; (4) ruin; (5) disorganisation; (6) rout.