New Delhi, July 30 -- The mobile phone alert message marked "URGENT" came with a beeeeeeep in the dead of night.

"Evacuate now," it said.

Suddenly awake, Morgane Bonichot scrambled. She grabbed her 9-year-old daughter, their rabbit and their dog but didn't think to pack underwear.

The 40-year-old childcare worker found herself swept up in one of the biggest evacuations Europe has seen since World War II, forced with more than 220,000 other people to flee a monster wildfire in southwest France that has consumed an area four times the size of Paris and is defying a massive effort, involving a dozen countries, to bring it under control.

In hindsight, Bonichot thinks maybe she should have seen it coming.

Her daughter was in the blaze's e...