Another aspect that went hand in hand with passive resistance was the widespread media coverage of such events. This won the support of powers all over the world and highlighted the violence that was at the heart of colonialism.
I think the key element in the Indian Independence movement was the force (pursued most fervently by Gandhi) of unification. The British used the forces of divisions (castes and religions) to maintain control over Indian society. Gandhi used the idea of unification and solidarity to break that control.
I think the word tactics isn't quite appropriate here. Maybe you should think of a word that describes what was done in a more positive light.
Mahatma(we prefer to use the title he was given with his name) Gandhi had a few objectives in mind to accomplish the goal of gaining freedom from the British. The primary one I think was to unite. The British tactics( it fits in here better) which they primarily used to establish rule over India was a policy of divide and rule. Make the smaller kings fight among themselves, create a divide between castes, religions, etc. In essence, to ensure that no substantially large force was present to oppose them.
It was essential to get rid of this divide and make everyone stand up united against the British. The non-violent way of protest that Mahatma Gandhi adopted, always making his actions speak louder than his words, appealed to everyone, who saw a true leader in him.
I often think that if the freedom movement had been a united effort accompanied by force India could have gained independence faster, but the argument against this has been that violence would have justified violence from the side of the British too and they were better equipped when it came to using force.
One of the major tactics was civil disobedience. The most famous example of this was the Salt March. In this incident, Gandhi and others went on a long campaign in which they broke the law by making their own salt at various points. They interspersed this with speech-making and recruiting efforts meant to gain more people for their movement. This tactic, then, revolved around openly (and ostentatiously) breaking the law so as to highlight the injustice of that law.
friends it is not the effort of Gandhiji only but the combined effort of others.
let say Veer Bhagat singh and his team who have bombed the court not to harm any but to threaten. They have surrender themselves and hangeg till death there sacrifice had provoke the indian citizen. it is they who had fill their heart with fire and now the gandhijis unity comes in to action