Prof Michael Brzoska and Dr Hans-Geporg Ehrhart organized an international workshop on the topic „Sliding out of control? Consequences of changes in warfare by major military powers from the „Global North“ for containment of warfare“ in Hamburg on 11 and 12 May 2017. The workshop was funded by the German Foundation for Peace. About forty participants from the USA, Great Britain, Fance, Russia, Sweden, Finland, Austria und Germany discussed in four panels questions of war and peace against the background of the changes in warfare of the states of the global North.