In 2013 and 2014, more than 30 German fighters joined Junud al-Sham (Soldiers of Syria), a Chechen jihadist group in northern Syria. Most of them hailed from the jihadist hotspots of Berlin, Bonn, and Frankfurt and belonged to a German group called Millatu Ibrahim (Abraham’s community) led by Austrian-Egyptian Mohamed Mahmoud. After the emergence of the Islamic State, most of these Germans left Junud al-Sham and joined the Iraqi-led organization. Nevertheless, their experience with the Chechen group was important because they received extensive training by Junud al-Sham and in many cases had their first battlefield experiences under its leadership. Moreover, the shared experiences of that group created tight bonds between Germans, Turks, Caucasians, and jihadis of other nationalities, which will likely shape the nature of the terrorist threat in Germany and other European states in the coming years.