German Empire
The high command under Paul von Hindenburg and Erich Ludendorff increasingly controlled the country, but in October after the failed offensive in spring 1918, the German armies were in retreat, allies Austria-Hungary and the Ottoman Empire had collapsed, and Bulgaria had surrendered. The Empire collapsed in the November 1918 Revolution with the abdications of its monarchs. This left a postwar federal republic and a devastated and unsatisfied populace, which later led to the rise of Adolf Hitler and Nazism.
Germanic Wars
"Germanic Wars" is a name given to a series of wars between the Romans and various Germanic tribes between 113 BC and 596 AD. The nature of these wars varied through time between Roman conquest, Germanic uprisings and later Germanic invasions in the Roman Empire that started in the late 2nd century BC. The series of conflicts, which began in the 5th century under the Western Roman Emperor Honorius, led (along with internal strife) to the ultimate downfall of the Western Roman Empire.
"For the timeline of events in Britannia after its abandonment by Emperor Valentinian III, see Timeline of conflict in Anglo-Saxon Britain."