When a few people are moving through thousands of civilians to do damage, the army is not the right response! Military action will kill many more innocent civilians than terrorists, and will unavoidably result in revulsion against the military and the authority that ordered the strike -- radicalizing the population against people they see as attacking them.

Hiding some weapons in a basement does not make a civilian area into a battlefield. Attacking that basement with military aircraft makes the civilian area into a battlefield.