1711. The French, fully aware of the political changes in England, had during the winter made extraordinary exertions to prolong the war for yet one more campaign, and to that end had covered the northern frontier with a fortified barrier on a gigantic scale. Starting from the coast of Picardy the lines followed the course of the river Canche almost to its source. From thence across to the Gy, or southern fork of the Upper Scarpe, ran a line of earthworks, extending from Oppy to Montenancourt. From the latter point the Gy and the Scarpe were dammed so as to form inundations as far as Biache, at which place a canal led the line of defence from the Scarpe to the Sensée. Here more inundations between the two rivers carried the barrier to Bouchain, whence it followed the Scheldt to Valenciennes. From thence more earthworks prolonged the lines to the Sambre, which carried them at last to their end at Namur.
This was a formidable obstacle to the advance of the Allies, but no lines had sufficed to stop Marlborough yet; and with Eugene by his side the Duke did not despair. Before he could start for the campaign, however, the news came that the Emperor Joseph was dead of smallpox, an event which signified the almost certain accession of the Archduke Charles to the Imperial crown and the consequent withdrawal of his candidature for the throne of Spain. Eugene was consequently
