wiberg.nu -> pastime -> suntzu

Sun Tzu Quotes

Generally, the principles of warfare are: The general receives
his commands from the ruler, assembles the armies, and mobilizes
the masses. Do not camp on difficult ground. Unite with your
allies on intersecting ground. Do not stay on open ground. Be
prepared on surrounded ground. Do battle on deadly ground. There
are routes not to be taken; there are armies not to be attacked;
there are walled cities not to be besieged; there are grounds not
to be penetrated; there are commands not to be obeyed.
                -- Sun Tsu, "The Art of War"