The intervention occurs with a humanitarian purpose, as in a country that just had a couple of its cities wasted by a natural disaster, like a tsunami or tornado.
Or in a country which its population has been suffering from hunger for decades due to political crises or coups
It can be ineffective or even destructive when:
It's a military extreme intervention on a city or country that although on war, it's still very populated by civilians. Like it was in the War on Terror campaign, started by the US after the 9/11 terrorist assault, with American invasion on Iraq, Afghanistan, Syria, and others. It ended up being effective, with even the fall of Al-Qaeda's terrorist organization leader in 2011, but in the process several cases of violent acts against and deaths of civilians were reported.
Defintion: the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views.
Genghis Khan was ruthless and very efficient when conducting scare tactics. His army was on horses, nimble and ready to surprise attack with swift strikes and to launch a hail of arrows while on the move. But most importantly he would not wage war just with soldiers but would also take hostages, torture and kill women and children and a lot more to scare his enemies into submission without too much fighting.