Before the Leaves Fall is a supplement for the Through the Mud and Blood ruleset by Dobbies Hobbies.
Before the Leaves Fall will provide you with army lists for Belgian, British, French, and German forces who fought on the Western Front from 1914 to 1915.
Also included are two scenarios,
The Battle for Mons and
The Battle for Halen.
To use these rules, you will need a copy of the main rules Through the Mud and Blood