Gandhi, not Ghandi.

Gandhi was most effective when the Indian armed forces rebelled.

MLK had Malcom X.

You need a good cop and a bad cop.

It depends. Do you regard your enemy as a good person doing a bad thing, or as a bad person doing a bad thing? If it's the former then teach them a better way a la MLK and Gandhi. If it's the latter, then teach them a better way a la Malcom X.

If you can see some compassion or love in your enemy's eyes, then every time they hold up their fist to beat you you should hold up a mirror.

Then of course there's Nelson Mandela. He started with peaceful means, came to the conclusion it was ineffective in his case and turned to violence. Later he refused opportunities to leave prison that would have required him to renounce violence. Ultimately, he didn't need to fire a shot after he was released but he would have done so with a clear conscience. Non-violence can be a moral choice, but so can violence in the face of great, violent injustice.

Of course, we're assuming asymmetric warfare here. No-one honestly believes FDR was wrong to declare war on Japan.