The clan managed to keep themselves in peace during the Edo period, although the Mori clan was arranged to be the supreme commander of the Western Army in the Battle of Sekigahara in 1600, and their territories were diminished to two provinces, Suo and Nagato.
しかし1600年の関ヶ原の戦いでは西軍の総大将に祭り上げられ、周防国・長門国の2ヶ国に減封されるも、江戸時代を通じて安泰であった。