I wouldn't go beyond the end of my street to defend my country. (And I'd be defending my locality against threat). If I was defending a way of life that I valued, that would be a different thing. Patriotism is, in my opinion, for fools. As Rudyard Kipling put it :
"It's Tommy this and Tommy that,
And 'Tommy here's my boot'.
But it's 'Tommy, you're a hero'
When the guns begin to shoot."
(I think it was Kipling.)
From Lurker:
1. The objective were truly pivotal in the war.
Over-stated, I think. There would have to be some good reason, a major potential pay-off in pursuit of a rational startegy. Heroes of legend have behaved suicidally in many cultures, and need I mention Thermopylae?
2. Only against military targets.
Too limiting. What about economic targets? Targets meant to sap the enemy's will to fight? War is intended to achieve
ends - in this case, shall we say defence of something valuable against aggression - by military means. So the ends must be weighed against the effects of a particular attack to decide if they are justified. The nature of the enemy, and the results of their victory, are crucial here - many peoples have been conquered in the past without great practical effect, whereas having Hitler's Wehrmacht or Saddam's Republican Guard bearing down on you is a different thing. And many peoples have destroyed themselves, or just made their future far worse, by fighting on for nationalist, patriotic reasons. See, for instance, the different experiences of the Serbs and the Bosnians when the Ottomans turned up.
Faked surrender is always out. It not only dishonours you, it betrays your comrades. As in Mazar-i-Sharif. Soldiers have always considered it a most heinous crime - worse than killing the wounded.
Torture is a tricky one, but treatment of prisoners is likely to be reflected by the opposition, so again we're into betraying comrades. (See Eastern front, WW2.) It can only be in the most dire of circumstances.
Guerilla warfare, why not? Perfectly legitimate tactic, used many times by people of great honour, such as the Welsh.
Human shields - what are you actually defending here?