Battle of the Lys

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Fourth Battle of Ypres

Part of the Western Front of World War I

Date	9 April - 29 April 1918
Location	Ypres, Belgium
Result	Eventual Allied Victory

Combatants

Image:Flag of the United Kingdom.svg United Kingdom
Image:Flag of Portugal.svg Portugal

Image:Flag of France.svg France

Image:Flag of the German Empire.svg German Empire

v • d • e

Western Front

Frontiers – Liège – Antwerp – Great Retreat – Race to the Sea – Neuve Chapelle – 2nd Ypres – 2nd Artois – Hill 70 – 3rd Artois – Loos – Verdun – Hulluch – Mont Sorrel – Somme – Arras – Vimy Ridge – 2nd Aisne – Messines – Passchendaele – Cambrai – Michael – Lys – 3rd Aisne – Belleau Wood – 2nd Marne – Château-Thierry – Hamel – Hundred Days

Image:British 55th Division gas casualties 10 April 1918.jpg

British 55th (West Lancashire) Division troops blinded by tear gas during the battle, 10 April, 1918.

Image:Trincheiras La Lys.jpg

Portuguese forces in trenches at the Lys, 1918.

Image:Prisioneiros ingleses portugueses 09 04 1918.jpg

British and Portuguese captured by German forces in the Flanders region (1918)

The Battle of the Lys (also known as the Lys Offensive, the Fourth Battle of Ypres and the Battle of Estaires) was part of the 1918 German offensive in Flanders during the World War I, originally planned by General Ludendorff as Operation George but scaled back to become Operation Georgette, with the objective of capturing Ypres. Starting on April 9, 1918, the battle lasted until April 29.

The German attack was able to smash through two Portuguese divisions. Although they captured some land, German forces were ultimately brought to a halt by French and British divisions. By April 29 Ludendorff ceased Georgette operations.

In one of the greatest failures in the military history of Portugal, the 2nd Portuguese Division, approximately 20,000 men commanded by General Gomes da Costa (later President of Portugal), lost about 300 officers and 7,000 men, killed, wounded and prisoners, resisting the attack of four German divisions, with 50,000 men of 6th German Army, commanded by General Ferdinand von Quast, in the first day of the German offensive.