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The Probert Encyclopaedia of Warfare

JACK

Picture of Jack

A jack or jaque was a coat of mail defensive body armour worn by troops from the 14th to the 17th century. It consisted of a leather surcoat worn over the hauberk, and was sometimes quilted like a gambeson.
Research Jack

JACKKNIFE

A jackknife or jack knife, is a large pocket knife with a folding blade (a clasp-knife).
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JAEGER

In the German army the term Jaeger refers to battalions of lightly armed infantry specialised in quick movement and pioneer duties.
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JANISSARIES

The Janissaries were a body of Turkish infantry formed about 1330 as the Sultan's bodyguard. They were originally composed chiefly of Christian captives, who were compelled to profess Islam. They were disbanded in 1826 after a number of revolts against the sultans.
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JAY-HAWKERS

The Jay-hawkers were guerrilla bands which carried on an irregular warfare in and around Eastern Kansas during the early part of the American Civil War and before that time.
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JIHAD

Jihad is a religious war conducted against non-believers by Muslims.
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JU-JITSU

Ju-Jitsu (Ju-Jutsu) is the Japanese method of self-defence which Dr. Kano studied and developed into the sport of judo.
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