There are roads which must not be followed, 407 armies which must not be attacked, 408 towns 409 which must not be besieged, 410 positions which must not be contested, commands of the sovereign which must not be obeyed. 411

The general who thoroughly understands the advantages that accompany variation of tactics knows how to handle his troops. 412

The general who does not understand these, may be well acquainted with the configuration of the country, yet he will not be able to turn his knowledge to practical account. 413