Dodecanese relative quiet and prosperity. In 408 BC, the three cities of Rhodes had united to form one state, which built a new capital on the northern end of the island, also named "Rhodes"; this united Rhodes was to dominate the region for the coming millennia. Other islands in the Dodecanese also developed into significant economic and cultural centers; most notably, Kos served as the site of the school of medicine founded by Hippocrates. However, the Peloponnesian War had so weakened the entire Greek civilization's military strength that it lay open to invasion. In 357 BC, the islands were conquered by
Massacre of the Acqui Division of the defence, Gandin and his men were either mutineers or "franc-tireurs" and did not qualify for POW status under the Geneva conventions. The Germans justified their behaviour by claiming the Italians were negotiating the surrender of the island to the British. The German claim was not entirely unfounded: in the Greek mainland, an entire division went over to the Greek guerrillas, and in the Dodecanese, the Italians had joined forces with the British, resulting in a two-month German campaign to evict them. An attempt to revisit the case by the Dortmund state prosecutor Johannes Obluda in 1964 came to