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Erquinghem-Lys (French pronunciation: ​[ɛʁkɛ̃ɡɛm lis]) (Erkegem an de Leie in West Flemish) is a commune situated in the Nord department in northern France.It is part of the Métropole Européenne de Lille. Erquinghem is one of a series of villages on the river Lys established by the Viking Rikiwulf in 880 AD at the time of the invasion led by Godfrid, Duke of Frisia: Racquinghem, Reclinghem, Rekkem and Rijkegem (the latter two now in West Flanders - Belgium). Erquinghem-Lys has been twinned with Skipton, North Yorkshire, England since 24 October 2009.

Ploegsteert (Picard: Ploster) is a village of Wallonia and a district of the municipality of Comines-Warneton, located in the province of Hainaut, Belgium. It is the most westerly settlement of Wallonia. It is approximately 2 kilometres (1.2 mi) north of the French border. Created in 1850 on part of the territory of Warneton, it includes the hamlet of Le Bizet, which is the border with France (there is also a hamlet named "Le Bizet" in France). It is largely francophone, with facilities for Dutch speakers. In late 1914 and early 1915, the nearby Ploegsteert Wood was the site of fierce WWI fighting. Today there are numerous cemeteries and memorials, including the Hyde Park Corner (Royal Berks) CWGC Cemetery and the Berks CWGC Cemetery Extension with the Ploegsteert Memorial to the Missing, which commemorates more than 11,000 British and Empire servicemen who died outside the Ypres Salient and have no known grave. From January to May 1916, Winston Churchill served in the area as Commanding Officer (Lieutenant-Colonel) of the 6th Battalion of the Royal Scots Fusiliers. Another nearby burial ground is the Lancashire Cottage Cemetery. As part of Comines-Warneton, Ploegsteert was declared a sister city of Wolverton, Buckinghamshire, England, in 2006; this was partly initiated through the finding of letters from a 16-year-old soldier from Wolverton named Albert French. He is buried in Hyde Park Corner (Royal Berks) Cemetery, just outside the village. The village is home to a carpentry museum.

Armentières (French pronunciation: ​[aʁmɑ̃tjɛʁ]; West Flemish: Armentiers) is a commune in the Nord department in the Hauts-de-France region in northern France. It is part of the Métropole Européenne de Lille.The motto of the town is Pauvre mais fière (Poor but proud).

Winter operations 1914–1915 is the name given to military operations during the First World War, from 23 November 1914 – 6 February 1915, in the 1921 report of the British government Battles Nomenclature Committee. The operations took place on the part of the Western Front held by the British Expeditionary Force (BEF), in French and Belgian Flanders. After the northern flank of the Western Front had disappeared during the Race to the Sea in late 1914, the Franco-British attacked towards Lille in October, then the BEF, Belgians and the French Eighth Army attacked in Belgium. A German offensive began on 21 October but the 4th Army (Generaloberst Albrecht, Duke of Württemberg) and 6th Army (Generaloberst Rupprecht, Crown Prince of Bavaria) 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 in the First Battle of Ypres (19 October – 22 November). By 8 November, the Germans realised that the advance along the coast had failed and that taking Ypres was impossible. Attacks by both sides had quickly been defeated and the opposing armies had improvised field defences, against which attacks were costly failures. By the end of the First Battle of Ypres in November 1914, both sides were exhausted, short of ammunition and suffering from collapses in morale; some infantry units refused orders. The mutual defeat of the First Battle of Flanders was followed by trench warfare, in which both sides tried to improve their positions as far as the winter weather, mutual exhaustion and chronic equipment and ammunition shortages allowed.

The Battle of Armentières (also Battle of Lille) was fought by German and Franco-British forces in northern France in October 1914, during reciprocal attempts by the armies to envelop the northern flank of their opponent, which has been called the Race to the Sea. Troops of the British Expeditionary Force (BEF) moved north from the Aisne front in early October and then joined in a general advance with French troops further south, pushing German cavalry and Jäger back towards Lille until 19 October. German infantry reinforcements of the 6th Army arrived in the area during October. The 6th Army began attacks from Arras north to Armentières in late October, which were faced by the BEF III Corps from Rouges Bancs, past Armentières north to the Douve river beyond the Lys. During desperate and mutually costly German attacks, the III Corps, with some British and French reinforcements, was pushed back several times, in the 6th Division area on the right flank but managed to retain Armentières. The offensive of the German 4th Army at Ypres and the Yser was made the principal German effort and the attacks of the 6th Army were reduced to probes and holding attacks at the end of October, which gradually diminished during November.

Fleurbaix (French pronunciation: ​[flœʁbɛ]; West Flemish: Vloerbeek) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.

Wulverghem (also known as Wulvergem) is a Belgian village. It is the smallest village in the Heuvelland Municipality, with 260 people, and a total area of 350 hectares.

Steenwerck (French pronunciation: ​[stɛ̃vɛʁk]; Dutch: Steenwerk) is a commune, in French Flanders, in the Nord department in northern France. It is located about 25 km (16 mi) north of Lille and in 2013 had a population of 3519. People from Steenwerck are known as Steenwerckois. It is home to Steenwerck's 100 km à pied race event, which mainly features a 100 km (62 mi) marathon, although most local residents prefer to merely walk one lap (roughly 22 kilometres (14 mi)). Steenwerck also has its own festival giant, as is the tradition in the Nord Department, which is named Totor and is one of the tallest, measuring 5.70 m (18.7 ft). Other places of interest include the Museum of Rural Life as well as three Commonwealth war cemeteries, and a German war cemetery, of the First World War.

La Chapelle-d'Armentières (French pronunciation: ​[la ʃapɛl daʁmɑ̃tjɛʁ]; Dutch: Armentiers-Kapelle) is a commune of the Nord department in northern France. It is part of the Métropole Européenne de Lille.

Bois-Grenier (French pronunciation: ​[bwa ɡʁənje]) is a commune in the Nord department in northern France. Located south of Armentières and bordering with the department of Pas-de-Calais.

The Gas attacks at Wulverghem (30 April and 17 June 1916) were German cloud gas releases during the First World War on British troops at Wulverghem in the municipality of Heuvelland, near Ypres in the Belgian province of West Flanders. The gas attacks were part of the sporadic fighting between battles in the Ypres Salient on the Western Front. The British Second Army held the ground from Messines Ridge northwards to Steenstraat and the divisions opposite the German XXIII Reserve Corps had received warnings of a gas attack. From 21 to 23 April, British artillery-fire exploded several gas cylinders in the German lines around Spanbroekmolen, which released greenish-yellow clouds. A gas alert was given on 25 April when the wind began to blow from the north-east and routine work was suspended; on 29 April, two German soldiers deserted and warned that an attack was imminent. Just after midnight on 30 April, the German attack began and over no man's land, a gas cloud drifted on the wind into the British defences, then south-west towards Bailleul. The gas used at Wulverghem was a mixture of chlorine and phosgene, which had been used against British troops on 19 December 1915 in the phosgene attack at Wieltje, north-east of Ypres. This and earlier gas attacks, beginning at the Second Battle of Ypres (21 April – 25 May 1915) had given the British time to replace improvised gas masks with effective mass-produced versions, obtain other anti-gas equipment and to establish anti-gas procedures. Helmets impregnated with chemicals to neutralise chlorine had been issued in several variants, each more effective than the last. By April 1916, British troops had PH helmets and some specialist troops like machine-gunners, were equipped with box respirators. The German gas attack at Wulverghem on 30 April, caused the defenders 562 gas casualties and 89 gas fatalities but German raiding parties, looking for mine entrances to destroy, were repulsed with small-arms and artillery fire. A second attempt by the Germans on 17 June caused about the same number of gas casualties but the British again easily repulsed German patrols.

Heuvelland (Dutch pronunciation: [ˈɦøːvəlɑnt] ) is a municipality located in the Belgian province of West Flanders. The municipality comprises the villages of Dranouter, Kemmel, De Klijte, Loker, Nieuwkerke, Westouter, Wijtschate and Wulvergem. Heuvelland is a thinly populated rural municipality, located between the small urban centres of Ypres and Poperinge and the metropolitan area of Kortrijk-Lille along the E17. On 1 January 2006 Heuvelland had a total population of 8,217. The total area is 94.24 km2 which gives a population density of 87 inhabitants per km2. The name heuvelland is Dutch meaning "hill country", as the municipality is characterized by the different hills on its territory.