First Army
Headquarters locations
26 December 1914: Hinges
27 December 1914: Lillers
1 February 1915: Aire-sur-la-Lys
7 May 1915: Merville
3 June 1915: Chocques
26 June 1915: Aire-sur-la-Lys
5 August 1915: Hinges
5 February 1916: Aire-sur-la-Lys
26 June 1916: Chocques
16 August 1916: Lillers
4 April 1917: Ranchicourt
29 March 1918: second echelon of First Army HQ (offices of Director of Medical Services, Deputy Director of Veterinary Services, etc) moved to Matringhem; main body of Army HQ remained at Ranchicourt
9 May 1918: second echelon of First Army HQ moved to Heuchin
17 October 1918: Duisans
26 October 1918: Auberchicourt
Second Army
Headquarters locations
26 December 1914: Bailleul
2 January 1915: Hazebrouck
6 May 1915: Chateau de Jardin at Oxelaere
23 October 1915: Cassel
14 April 1918: Blendecques
1 September 1918: Cassel
23 October 1918: Chateau Ternynck at Roubaix
Third Army
Headquarters locations
13 July 1915 : St Omer
19 July 1915 : Beauquesne
20 March 1916 : St Pol sur Ternoise
1 May 1917 : Noyelle Vion
1 July 1917 : Albert
23 March 1918 : Beauquesne
8 April 1918 : Hesdin
30 July 1918 : Villers l’Hopital
21 October 1918 : Masnieres
Fourth Army
Headquarters locations
5 February 1916 : Tilques
24 February 1916: Querrieu
15 April 1917: Villers Carbonnel
5 July 1917: Malo-les-Bains
25 October 1917 : Rosendael (Dunkirk)
5 November 1917 : Dury
9 November 1917: staff and HQ of Fourth Army takes over from Second Army at Cassel. On 20 December 1917 what had been Second Army was renamed as Fourth Army. On 13 March 1918 the units under Fourth Army were placed under command of the reconstituted Second Army and four days later what had been Fourth Army was renamed as Second Army.
22 March 1918 : Querrieu
25 March 1918 : Picquigny-sur-Somme
27 March 1918 : Abbeville. Next day, Fourth Army took over command of Fifth Army. The latter ceased to exist on 2 April 1918.
30 March 1918 : Auxi-le-Chateau
31 March 1918 : Flixecourt
2 April 1918 : Dury
5 April 1918 : Flixecourt
30 August 1918 : Bertangles
25 September 1918 : Eterpigny
14 October 1918 : Montigny Farm (Roisel, HQ located in a train)
3 November 1918 : Honnechy (in a train)
Fifth Army
Headquarters locations
22 May 1916: Regnières-Ecluse
12 June 1916: Daours
2 July 1916: Toutencourt
28 March 1917: Albert
2 June 1917: La Lovie, near Poperinghe
15 November 1917: Dury
13 December 1917: Villers-Bretonneux
15 February 1918: Nesle
22 March 1918: Villers-Bretonneux
25 March 1918: Dury
… after reconstitution …
23 May 1918: Crécy-en-Ponthieu
27 June 1918: Upen d’Aval
21 October 1918: Labuissière
26 October 1918: advanced Army HQ at Lille
29 October 1918: whole Army HQ at Lille
Cheers,
shredward