October Revolution
Refers specifically to the Russian October Revolution of 1917. In Japanese historical context, it is called 十一月革命 (November Revolution) because Russia used the Julian calendar at the time.
See also: 十月革命
The October Revolution was a crucial turning point in Russian history.
German Revolution
Refers to the German Revolution of 1918–1919. In Japanese, it is also called ドイツ革命.
See also: ドイツ革命
As a result of the German Revolution, the German Empire collapsed.