Spoiler
1914:
Battle of the Frontiers (21-24 August): Pierrepont, near Charleloi, Baslieux, Bois de Goemont, Bois de Grandchamps, Bois de Doncourt
Casualties: 800 men and officers - 27%
Casualties for August 22 only: 720 men and officers - 55%
Battle of the Marne (6-14 September): Villeneuve, Charleville, Soizy-aux-Bois, (6-7 Sept.); Corfélix and Culots (8 Sept.); Château de Mondemont, La Fère-Champenoise, Villeseneux (9-11 Sept.); near Auberive (12-17 Sept.); near Prosnes and Ferme des Marquises (17-22 Sept.); Sillery (24 Sept.)
Casualties (6-8 Sept. only): 600 men and officers - 36%
Battle of the Yser and the Ypres (23 October-30 December): Lombaertzyde, Nieuport, Ramscapelle, Dixmude, Steenstraate, Ypres (23 Oct.-2 Nov.); Woumen and Clercken (3 Nov.); Bixshoote and Kortekeer Cabaret (6 Nov.); Cote 60, Ferme Grœnenbourg (9-30 Dec.)
Casualties: 1,000 men and officers - 50-65%
Total Casualties 1914: 2,400 men and officers - 113-128%
1915:
The Argonne (17 January-19 July): La Harazée--Vienne-le-Château: Fontaine-Madame (Jan.-March); Bois de la Gruerie: Blanlœil, Four-de-Paris, Fontaine aux Charmes (April-19 July)
Casualties for Jan. to July: 4,200 men and officers - 175%
Casualties for July 1-3 only: 1,330 men and officers - 55%
Second Battle of Champagne: Aubérive-sur-Suippes (25-30 Sept., October 6)
Casualties: 1,800 men and officers - 75%
Total Casualties 1915: 6,000 men and officers - 250%
1916:
Battle of Verdun: Carrières d'Haudromont and Bois Nawé (26 Feb.-30 March); Mort-Homme (3 April-22 May)
Casualties: 2,000 men and officers - 83%
Battle of the Somme: Rancourt (19-30 Sept.); Bois de Saint-Pierre-Waast, Sailly-Saillisel (6-10 Oct., 14 Oct.-7 Nov.)
Casualties (25-27 Sept. only): 662 men and officers - 26%
Casualties: 1,926 men and officers - 80%
Total Casualties 1916: 3,926 men and officers - 163%
1917:
Aisne/Chemin des Dâmes (16 April-19 May): Ferme de Choléra, Ferme de Mauchamp, near Guignicourt, Bois des Beliers, La Miette
Casualties: 1,000 men and officers - 42%
Note: The regiment wins the Croix de Guerre for its actions on the Aisne, only the eleventh regiment to do so at this date.
Verdun (16 July-September): Bois des Carrières and Ferme des Chambrettes (16 July-26 Aug.); Bois de Chaume, Bois des Fosses (Sept.)
Casualties: 730 men and officers - 35%
Neufchâteau (October-January): Training the U.S. 104th I.R. (26th I.D., 1st Army Corps, AEF) and the 5 Marines (4th Brigade, 2nd I.D.)
Total Casualties 1917: 1,730 men and officers - 77%
1918:
Aisne (June-July): Gournay-sur-Aronde (9-16 June); Saconin, Vauxbuin (Vaurhuin), Villeneuve-St.-Germain, Ferme de Montlave (18 July-2 Aug.)
Casualties: 700 men and officers - 29%
Soissons (28-31 Aug.): Vauxrot, St. Vaast (Waast), St. Medard, Crouy
Casualties: 460 men and officers - %
St. Genevieve (September-October): Xon, Bois de la Voivrotte (25-26 Sept.); Bouxieres-aux-Chenes (13 Oct.-11 Nov.)
Casualties for 25-26 Sept.: 300 men and officers
Total Casualties 1918: 1,430 men and officers - 65%
TOTAL CASUALTIES 1914-1918: 16,000 men and officers - 670%
Courtesy of the official 151e reenactor website!