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The Battle of the Lys (7–29 April 1918), also known as the Lys Offensive, the Fourth Battle of Ypres, the Fourth Battle of Flanders and Operation Georgette (Portuguese: Batalha de La Lys and French: 3ème Bataille des Flandres), was part of the 1918 German offensive in Flanders during World War I, also known as the Spring Offensive. It was originally planned by General Ludendorff as Operation George but was reduced to Operation Georgette, with the objective of capturing Ypres, forcing the British forces back to the channel ports and out of the war. In planning, execution and effects, Georgette was similar to (although smaller than) Operation Michael, earlier in the Spring Offensive.The German attack zone was in Flanders, from about 10 kilometres (6.2 mi) east of Ypres in Belgium to 10 kilometres (6.2 mi) east of Béthune in France, about 40 kilometres (25 mi) south. The front line ran from north-north-east to south-south-west. The Lys River, running from south-west to north-east, crossed the front near Armentières in the middle of this zone. The front was held by the Belgian Army in the far north, by the British Second Army (under Plumer) in the north and centre and by the British First Army (under Horne) in the south. The German attacking forces were the Sixth Army in the south (under Ferdinand von Quast), and the Fourth Army in the north (under Sixt von Armin). Both armies included substantial numbers of the new stosstruppen, trained to lead attacks with the new stormtroop tactics.
The British First Army was a relatively weak force; it included several worn-out formations that had been posted to a "quiet sector". This included two divisions of the Portuguese Expeditionary Corps, which were undermanned, lacked almost half of their officers, had very low morale and were set to be replaced the day of the German attack. The German plan was to break through the First Army, push the Second Army aside to the north, and drive west to the English Channel, cutting off British forces in France from their supply line which ran through the Channel ports of Calais, Dunkirk and Boulogne.
Battle of Estaires (9–11 April)
The German bombardment opened on the evening of 7 April, against the southern part of the Allied line between Armentières and Festubert. The barrage continued until dawn on 9 April.
Operation Georgette ジョルジェット作戦
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