Early in WWI Châtillon's Marmont Castle was the headquarters of General Joffre who launched the first battle of the Marne from there on September 5, 1914.
At the end of WWII Châtillon was liberated by a joint effort of the 1st Regiment of Marines and the 1st Regiment of Moroccan Spahis on September 12, 1944.
The local economy is predominantly agricultural although there is a small industrial base comprising a metal packaging company and a plywood manufacturer jointly employing a little over 300 people.
There are a number of sights around town, some of which can be seen here.