Thanos on DC Earth
Somehow Thanos gets transported to DC Earth 1 (Pre-Flashpoint). He lands 20 Miles from a populated city in Bialya. He has no Tech of his own carried over from Marvel but I suppose his connection to Death still remains in tact. He has 5 days to conquer or destroy the Planet. He has 1 Month to Conquer or Destroy the planet Earth.
Does he do it? How?
Explain your Reasoning, as in what tech does he utilize, who does he make a pact with and betray later, etc?