Allies
Soviet Union (1941-45)
United States (1941-45)
British Empire
China (at war 1937-45)
France
Poland
Canada
Australia
Yugoslavia (1941-45)
Greece (1940-45)
Norway (1940-45)
Netherlands (1940-45)
Belgium (1940-45)
Czechoslovakia
Brazil (1942-45)
...and others
Client and puppet states
India
Egypt (1940-42, 1945)
Philippines (1941-45)
Syria (1941, 1945)[nb 4]
Mongolia (1941-45)
...and others
Axis
Germany
Japan (at war 1937-45)
Italy (1940-43)
Romania (1941-44)
Hungary (1941-45)
Bulgaria (1941-44)
Thailand (1942-45)
Co-belligerents
Vichy France (1940-44)
Finland (1941-44)
Iraq (1941)
Client and puppet states
Manchukuo
Italian Social Republic (1943-45)
Independent State of Croatia (1941-45)
Slovakia
...and others
The Allies fought together. By numbers they were British, American, Canadian, Australian, Polish, New Zealand, French, Dutch, Belgian and Greek.
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Italy was in the Triple Alliance and fought for the Allied Powers. The remaining two, Germany and Austria-Hungary, fought for the Central Powers.
peloponnesian war
Germany
The Battle of Savannah was fought between the British (and their allies, the Germans) and the Americans (Patriots) (and their allies, the French).
Sparta and its allies and Athens and its allies/empire.
Athens and its allies and Sparta and its allies.
Athens and its allies and Sparta and its allies.
The allies.
Only the Germans fought the Allies on D-Day, other Axis powers were not involved.
In the Punic Wars, Rome and its allies fought Carthage and its allies.
The city states of Athens and Sparta and their allies fought each other in the Peloponnesian War .
prussa
The French
The Allies fought together. By numbers they were British, American, Canadian, Australian, Polish, New Zealand, French, Dutch, Belgian and Greek.
Well they had allies and fought on the same side. I hope it helped.