Dee ihe ọzọ maka paragraf a - Mgbe Agha Ụwa nke Mbụ tiwapụrụ na 1914, Jacob so ndị agha Meerut, nke so n'òtù ndị agha India, gaa n'Ọdịda Anyanwụ Ụwa. Ọ lụrụ agha n'oge ikpeazụ nke Agha La Bassée.
n'October nke afọ 1914. N'ịbụ onye e buliri n'ọkwa brigadier-general na 5 Jenụwarị 1915, a họpụtara ya ka ọ na-achị Dehra Dun Brigade, ma duru ndị agha ahụ na Agha nke Neuve Chapelle na Machị 1915 na Agha nke Aubers Ridge na Mee 1915. N'ịbụ onye e buliri n'ọkwa onye isi ndị agha na-adịru nwa oge na 7 Septemba 1915, ọ ghọrọ General Officer Commanding nke ngalaba Meerut ma duru ngalaba ahụ na Agha nke Loos na Ọktọba 1915. Ebe ndị Indian Corps na-akwado ịhapụ Western Front, a họpụtara ya ka ọ were ngalaba nke 21 nke "New Armies" na 18 Nọvemba 1915. E buliri ya n'ọkwa nke onye isi ndị agha na 1 Jenụwarị 1916 ma n'agbanyeghị na ọ merụrụ ahụ na Machị 1916, e buliri ya n'ọkwa nke onye isi ndị agha na-adịru nwa oge na 28 Mee 1916 ma họpụta ya ka ọ na-edu ndị agha nke abụọ na ndị agha nke ise na Septemba 1916. N'oge Agha nke Somme, ndị agha ya mere mwakpo ndị Britain n'oge Agha nke Thiepval Ridge na Septemba 1916 na mwakpo ọzọ na St Pierre Divion n'oge Agha nke Ancre na Nọvemba 1916. Ọ nọgidere na iwu nke II Corps, ebe e buliri ya n'ọkwa nke lieutenant-general na 3 June 1917, maka Agha nke Passchendaele n'oge mgbụsị akwụkwọ 1917.