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During the mobile operations of 1914, armies which operated in enemy territory were forced to rely on wireless communication to a far greater extent than anticipated, having expected to use telegraph, telephones and dispatch riders. None of the armies had established cryptographic systems adequate to protect wireless transmissions from eavesdropping; all of the attacking armies sent messages containing vital information in plain language. From September to November 1914, the British and French intercepted c. 50 German messages, which showed the disorganisation of the German command in mid-September and the gap between the 1st and 2nd armies on the eve of the Battle of the Marne. Similar plain language messages and some decodes of crudely coded German messages, gave warnings to the British of the times, places and strengths of eight attacks of four corps or more, during the Race to the Sea and the subsequent battles in Flanders. Both sides tried to advance, after the "open" northern flank had disappeared, Franco-British attacks towards Lille in October were followed by attacks of the BEF, Belgians and a new French Eighth Army. A German offensive began on 21 October but the 4th and 6th armies were only able to take small amounts of ground, at great cost to both sides, at the Battle of the Yser (16–31 October) and further south at Ypres. Falkenhayn then attempted to achieve the limited goal of capturing Ypres and Mount Kemmel, from (19 October – 22 November). By 8 November, Falkenhayn accepted that the advance along the coast had failed and that taking Ypres was impossible. The French and Germans had failed to assemble forces near the northern flank swiftly enough to obtain a decisive advantage. Attacks had quickly been stopped and the armies had then improvised field defences, against which attacks were repulsed with many more casualties. By the end of the First Battle of Ypres, both sides were exhausted, short of ammunition and suffering from collapses in morale; some infantry units refused orders. The mutual failure in Flanders, led both sides to elaborate the improvised field fortifications of 1914, which made a return to mobile warfare even less likely. In November, Falkenhayn reconsidered German strategy, because the failures on the Yser and at Ypres, showed that Germany lacked the forces in the west to obtain a decisive victory; Vernichtungsstrategie and a dictated peace were beyond German resources.
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