"Following the collapse of the Bronge Age in the eastern Mediterranean, due to invasion, famine, plague, volcanic eruption, seismic activity, divine intervention or any combination thereof, Athens no longer has a king - "

My point here is if we should speak of divine intervention as causing any events in history, for, as I see it, we are writing as historians, don't we? Or perhaps I don't see your point.

[...]laid siege to the “wooden walls” that protected the elderly and the unfit for combat" Athen's walls, right? :)
right; and I don't need the quotes there do I?" Of course you don't need them.

"and your sentece needs a n :)"
Right. Proofreading is an infinite task.
Best.