European concert, Concert of Europe n. An agreement or understanding between the chief European powers to take only joint action in the (European) Eastern Question.
... was expending a type of praise upon the British Army which would have been even more appropriate to the Prussian Army. The Prussian Army ruled Prussia; Prussia ruled Germany; Germany ruled the Concert of Europe. She was planting everywhere the appliances of that new servile machinery which was her secret; the absolute identification of national subordination with business employment; so that Krupp could count on Kaiser and Kaiser on Krupp. ... — The Crimes of England • G.K. Chesterton
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