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After the German invasion of Themyscira, Steve Trevor informed the Amazons that the war to end all wars was currently raging in the world of man. Convinced that Ares is behind it all, Diana left the island alongside Trevor to go and stop the god of war, which in her mind would end all of the fighting.
After arriving in London, Diana and Steve, together with a small support group, headed to the front to covertly search for some sort of large offensive being planned by General Ludendorff and Doctor Poison. Ultimately, the group discovered a massive factory producing huge amounts of poison gas, which was to be flown to the United Kingdom to decimate London.
Diana, convinced that Ludendorff was Ares in disguise, defeated him in battle. The real Ares, however, shortly thereafter revealed himself to Diana.
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- "I used to want to save the world - to end war and bring peace to mankind."
- ―Diana, reflecting on her introduction to humanity
After her involvement in the war, Diana largely stepped away from heroics until the 1980s.