In 1917 , Henry White lent White - Meyer to the French mission of Marshall Joffre to use as its headquarters .
While the French flag flew outside of the residence , Marshall Joffre used the house to host high - level strategic meetings .
In 1917 , Henry White lent White - Meyer to the French mission of Marshall Joffre to use as its headquarters and while the French flag flew outside of the residence , Marshall Joffre used the house to host high - level strategic meetings .