| 11. | But the economic plan " Mitteleuropa " depended on the Quadruple Alliance which was in trouble.
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| 12. | The Concert of Europe was the political framework that grew out of the Quadruple Alliance, in November 1815.
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| 13. | The Quadruple Alliance, confirmed by a number of international conferences, ensured Russia's influence in Europe.
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| 14. | These events combined to eventually force the Spanish king to accept the terms of the Quadruple Alliance in 1720.
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| 15. | Grey retained his seat in the Triple Alliance, causing the press to write of a " Quadruple Alliance ".
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| 16. | In 1718 he served in the War of the Quadruple Alliance in Sicily, in his father's regiment.
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| 17. | In 1719, during the War of the Quadruple Alliance, the French again attacked, but failed to take Roses.
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| 18. | In the ensuing War of the Quadruple Alliance British forces were involved in a campaign to prevent Spanish expansion in Italy.
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| 19. | Spain eventually lost Sicily in 1713, but invaded the island five years later during the War of the Quadruple Alliance.
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| 20. | On 2 August, the Emperor joined the Triple Alliance, which became the Quadruple Alliance for which the war is named.
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