I think the IRA and the ANC are great examples to suggest that violence and "relentless attack" aren't necessarily the best options when trying to combat "terrorism".
The IRA are a brilliant example of this in how they became popular: they had very little support when they took (British) Dublin, by force, in Easter 1916. Yet, after the execution (for high treason) of the leaders, when some were still badly wounded from the British counter-attack, turned far more against the British than had ever been before: the British turned those freedom fighters who few supported into martyrs for their cause.