After seven years employed with his regiment, he was then employed as subordinate to the
collector of Gujarat. In 1838 he was ordered to
Sind with the
Bombay column, to join the Army of the
Indus at the outbreak of the
First Anglo-Afghan War. He first saw active service in the summer of 1839 as a
subaltern of artillery, the force led by
Sir John Keane, sent to invade the
Upper Sindh. He was given command of the
Sind Horse by
Sir James Outram in 1841; in 1842 he was additionally placed in political charge of the whole of the
Cutchee frontier. He saw his first major action as
Brevet-captain at the
Battle of Meanee, with the British force sent to conquer Sindh. He was made a
Companion of the Order of the Bath. He set about to recruit a second regiment of Sind Horse, which Napier announced in a letter dated 28 November 1846 would be called Jacob's Horse. As
Irregular cavalry, each regiment had only three European officers, a system that Jacob argued should be extended to all Indian cavalry regiments. Both regiments were absorbed into the
Indian Army in 1860 and ultimately became the
35th Sind Horse and the
36th Jacob's Horse. They saw active service in Northern and Central India,
Persia and
Afghanistan, and during
World War I in
France. They were amalgamated in 1921 and became known as the
14th Prince of Wales's Own Scinde Horse. ==Transforming the Village of Khangarh to City of Jacobabad==