That would be 1066 when William (the Conqueror) of Normandy invaded (and conquered) England. Initially this meant that the King of France received taxes from England but it also meant that England ruled Normandy. But through marriages the King of England (this is 100s of years later) ended up ruling half of France. This meant the two countries started contesting for power.
When, finally, England was ousted from France after the Hundred Years War it wasn't long before they had something else to fight about. In 1492 Cristopher Columbus returned from his voyage to the New World with stories of a land rich in gold and precious minerals. England, France and Spain leapt at the chance of riches and new lands and all three fought each other for power for hundreds of years.
When all of that calmed down it was time for a Corsican by the name of Napoleon Boneparte to bring his ideas for France. This meant conquering most of Europe with only Spain, Portugal and the UK standing against him.
For some reason after that England and France were relatively friendly with each other.
The answer to your question is 1066 but I thought a history of English-French wars might be useful to you.
The French Normans invaded England in the year 1066
The french have invaded England but never ruled it and always failed.
become simultaneously kings of England and France
same time as England
France had a warmer climate than England. Therefore, civilization came to France earlier than to England. Because of this, England became a kind of colony of France. But the warm climate is the reason for the low technological ceiling. And one day France reached its ceiling and lagged behind England. And England went to war with France to gain freedom from colonial status Long, long 100 year war
france aPLUS
France , Italy ,England, and Spain
The British
become simultaneously kings of England and France
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France was an enemy of Japan.
The Letter 'N' : London France ^ ^ ------->^
Had a treaty with Poland
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France, a centuries old enemy of England, came to the American's side once the Americans won the Battle of Saratoga. This win convinced the French that America could defeat England. Only then did France ally itself with America to the extent it sent its navy to help.
At various times in history, France has been at war with the Roman Empire, England, Russia, and Germany.they never concord russia
same time as England
England, France, China, Belgium, Netherlands, Switzerland, Bahamas, Russia, Poland.
Because the Enemy of my Enemy is my Friend. Anything they could do to bring injury, inconvenience or discomfort to the United Kingdom was something that France was in favor of.