The classic manual on all of this is, of course, that magnificent (if brutal and cynical) book by Clausewitz On War, which can be usefully supplemented by Machiavelli’s marvellous advice in The Prince, as well, nowadays, many manuals put out by your Departments of War (sorry, we should have said of Defence).
Let us remind you of a few of their central bits of advice, things like: act first, constant preparation and arms stockpiling, strike mercilessly, be prepared, iron and fire, deception and lying and so on.
So this is how you should behave in Christ’s wars. It was how we treated the heathen Saracens in the Crusades, how we exterminated the Albigensian heretics, how we destroyed the savages around the globe who opposed your glorious kingdoms. There is no room for scruple in these matters.
If all this is true of ordinary wars, imagine how much more it is the case in a religious war against civilization’s enemies. These enemies will use any tactics against you. Even if, as yet, their attacks have been limited (the whole twin towers was less than a month’s civilian death toll in Iraq), we must not be lulled, for they would kill many times that number if they could, and rejoice at the carnage. Even if the amount of death and destruction you have brought down upon them is many times more than what they have done to you, do not relent. Even if they have not done many of the things which they could have done with ease; poison the water systems, spread plagues, bomb nuclear plants, you should still speak angrily of them as ‘totally unscrupulous’. You must continue to describe them as utterly ruthless and as using all means against you. Then you are justified in whatever methods you like.