[mjp]

On returning to Greece, however, and in the sudden absence of any other threat, Zangger believes the Mycenaeans squabbled and fell into civil war – events hinted at in Homer’s Odyssey. Their civilisation was the last in the area to collapse.

what about the Dorians?

[ProtectOurFreedom]

That is a gray area.

[SunkenCiv]

They were a minor mode. /rimshot

> Most scholars doubt that the Dorian invasion was the main cause of the collapse of the Mycenean civilization.

https://en.wikipedia.org/wiki/Dorians#The_Dorian_invasion