English: This map, which is an annotated version of the public domain map 'Atlas Historico da Guerra do Paraguay", Plates 4 and 5, by E.C. Jourdan of the corps of engineers of the Brazilian army (Rio de Janeiro: 1871) shows the concept of the Mitre/Caixas flanking plan by which the fortress would be encircled and cut off by land. On the left is the River Paraguay; the fortress blocks its navigation.
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