Following is the September 2023 installment of “ISIS Redux: The Central Syria Insurgency,” a monthly chronicle of attacks by the terrorist group ISIS in central Syria. A review of developments throughout 2022 and 2021 can be found here and here. The January 2023 edition can be found here, February’s here, March’s here, April’s here, May’s here, June’s here, July’s here, and August’s here. A full background and analysis of ISIS’s resurgence in Syria, including the methodology used to collect this data, can also be explored here, here, and here.