 Ramba uchinyora ndima iyi - Pakatanga Hondo Yenyika Yokutanga muna 1914, Jacob akaenda neMeerut division, chikamu chemauto eIndia, kuWestern Front. Akaona chiito mumatanho okupedzisira eBattle of La Bassée muna October 1914. Akakwidziridzwa kuva brigadier-general wenguva pfupi musi wa 5 Ndira 1915, akagadzwa kuti atungamire Dehra Dun Brigade, uye akatungamira brigade muHondo yeNeuve Chapellemuna March 1915 uye Hondo yeAubers Ridge muna May 1915. Akasimudzirwa kuva mukuru mukuru wenguva pfupi musi wa7 Gunyana 1915, akazova General Officer Commanding we Meerut division uye akatungamira iro divi muhondo yeLoos muna Gumiguru 1915. Ne Indian Corps yakanga ichigadzirira kusiya Western front, akagadzwa kuti atore 21st Division ye New Armies musi wa 18 Mbudzi 1915. Akakwidziridzwa pachinzvimbo chemauto mukuru musi wa1 Ndira 1916 uye kunyangwe akakuvara munaKurume 1916, akasimudzirwa kuita lieutenant general wenguva pfupi musi wa28 Chivabvu 1916 uye akagadzwa kutungamira II Corps muChishanu Mauto munaGunyana 1916. Munguva yeHondo yeSomme, mauto ake akaita kurwisa kweBritain panguva yeHondo yeTiepval Ridge munaGunyana 1916 uye kurwisa kwakazotevera paSt Pierre Divion panguva yeHondo yeAncre munaNovember 1916. Akaramba ari mutungamiri we II Corps, akasimudzirwa kuva mukuru mukuru wevatungamiri vepamusoro musi wa 3 June 1917, nokuda kweHondo yePasschendaele muna Autumn 1917. 