A Military alliance is an agreement between two, or more, nations; related to wartime planning, commitments, and/or contingencies; such agreements can be both defensive and offensive. Military alliances often involve non-military agreements, in addition to their primary purpose.
Historic Military Alliances:
- Wars of Scottish Independence
- Italian Wars
- Wars of the Schmalkaldic League
- Schmalkaldic League - German Protestant States
- Thirty Years War
- Catholic League (German) - Bavaria, other Catholic German States
- Protestant Union - Protestant German States
- War of the Grand Alliance (Nine Years War)
- League of Augsburg - Holy Roman Empire, Spain, Austria, other German states
- War of the Spanish Succession
- Napoleonic Wars
- The Quadruple Alliance of 1814/15
- First through Seventh Coalitions
- The Quadruple Alliance of 1834
- League of Nations
- World War One
- Allies - Great Britain, France, Russia (to 1917), United States (from 1917)
- Central Powers - Germany, Austria-Hungary, Ottoman Empire
- World War Two
- Axis Powers - Germany, Japan, Italy
- Allies (United Nations) - United States (from 1941), Great Britain, France, Soviet Union (from 1941)
- Cold War
- North Atlantic Treaty Organization (NATO) -- United States, Canada, most of Western Europe (still an active alliance)
- Warsaw Pact - Soviet Union, East Germany, Hungary, Poland, Czechoslovakia
- North Atlantic Treaty Organization (NATO) - United States, Canada, most of Western Europe, parts of Eastern Europe
- United Nations (UN) - 191 nations