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Quadrilateral

The four fortresses of Peschiera and Mantua on the Mincio, with Verona and Legnago on the Adigë. Now demolished.

The Prussian Quadrilateral.
The fortresses of Luxemburg, Coblentz, Sarrelouis, and Mayence.

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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