I think the whole TV series has already departed too much from the Comics Prison Ark... the "assault" was the Governor with 6 guys shooting aimlessly, the "tank" who took down the Prison's defences was this Armoured Truck, only Axel got shot(sadly) and the rest seem to be doing fine or at least "safe" for now. I don't believe there'll be a "final assault", a run to the armoury or anything remotely similar to what happens in comics, I think they are even wondering about where to go with Tyreese's group right now.
Will the writers script in another "assault"? or are they going to go with the "it's time to strike back" argument line? In any case this whole Woodbury vs. Prison storyline has to stop in about 4 or 5 episodes before it becomes boring, and for that to happen there has to be an escalation of hostilities or some sort of third-player(could be herds, other humans, whatever) that drives them into a pact/alliance.