The first of these invasions is marked by evidence of fire in many Greek settlements including Asea, Korakou, and Eutresis. Corinth was deserted afterward and Asine (Argolis) badly damaged.
The second invasion, more relevant to this post, was much more widespread. All of the Eastern Mediterranean was in decline and vulnerable, so the stage was set for traumatic changes to the early civilized world. Egypt, furthest from the source of the invaders, beat off attacks in 1230 and 1190 B.C. The coasts of Cyprus, Palestine, and Syria were attacked. The Assyrians were humbled and rendered impotent as a power and the Hittite Kingdom disappeared all together.