I think you are referring to Alsace.
Alsace is a flat bottomed rift valley, separated from France by the Vosges mountains.
It was originally inhabited by German-speaking peoples at the end of the Roman Empire and became part of the German Empire. in 1648 (end of 30 years war) part (but not all) of Alsace was annexed by France. The last part of Alsace (the city of Mulhouse) was annexed in 1798
Since then Alsace and has changed hands 4 times.
Alsace
Protestant Germany
Denmark, Sweden, France, and Spain.
King Louis XV of France.
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Most of the first or early battles of the Thirty Years' War were won by the Hapsburgs. France won the war in the end.
France emerged from the Thirty Years' War as the dominant European nation. The Holy Roman Empire had lost its control of the nation.
the thirty years war
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The Thirty Years' War.
I believe France pursued a policy of supporting the Prostestant Princes and Rulers against the Hapsburgs.
treaty of nijmegen:)The Hundred Years' War.30 years war was the conflict that made France the most powerful country in Europe.
The Thirty Years' War began in 17618 in Bohemia. At that time the Protestants were rebelling against their Hapsburg Catholic rulers. The Protestants elected as their king the Count Palatine of the Rhine who was a Protestant. The armed conflict heated up at its beginning when armies of the Catholic princes and the armies of Spain intervened.