Conversation so far:
When did the Etruscans expand?
Etruscan expansion into Southern Italy, present day Campania region, and northwards into the Po Valley occurred yet in the 9th century BC.
What was the outcome of Etruscan focus beyond the Apennine Mountains and into Campania?
Some small towns in the sixth century BC disappeared during this time, ostensibly subsumed by greater, more powerful neighbours.
How did mining proceed as Etruscans expanded?
The mining and commerce of metal led to an enrichment of the Etruscans and to the expansion of their influence in the Italian peninsula and the western Mediterranean Sea.

Question: How did the Greeks respond to their expansion?
Self-contained rewrite: How did the Greeks respond to Etruscan expansion?