Do not fear the enemy, for they can take only your life. Fear the media far more, for they will destroy your honour.
Confuse the enemy. Keep him in the dark on your intentions. Sometimes what seems a victory isn't really a victory and sometimes a defeat isn't really a defeat. Whether in attacking, counterattacking, or defensive tactics, the idea of attacking should remain central, to always keep the initiative.
Any forces that would impose their will on other nations will certainly face defeat.
My fighting gospel is T.E. Lawrence's Seven Pillars of Wisdom. I am never without it.
