=Hussars.=--Light cavalry. Derived from the Hungarian (_huss_) twenty and (_ar_) pay, because every twenty houses had to provide one horse soldier. =Imperial Light Horse.=--_See_ vol. iii. p. 165. =Infantry.=--Foot soldiers. The words derived from the Spanish soldiery of the _infanta_, and the term _infanteria_ was applied to them, in consequence of their being the troops of the Infanta of Spain. The British infantry was declared by Marshal Soult "the finest in the world." There are 109 infantry regiments in the British army. The oldest of these, formed between 1660 and 1662, are the Guards, the 2nd Queen's (raised for the defence of Tangiers), and the 3rd Buffs (the old London train-bands). =Intelligence Department.=--A branch of the Quartermaster-General's Department, which has for its object the collecting and sifting and arranging information useful to Government or army in peace or war. =Intrench= or =Entrench=.--To secure a position or body of men against the attack of the enemy by digging a ditch or trench. =Invest.=--To surround a place and prevent all communication with the outer country. =Irregular Troops.=--Troops which do not belong to the regular forces. Until lately there were no such troops in the British Army, now it is almost impossible to enumerate them. In India there are several irregular forces of cavalry and infantry for the protection of Native States. =Jack.=--The nation's "pet" name for a sailor, as "Tommy" is the "pet" name for a soldier. =Jacobsdaal.=--Small town in the Orange Free State. =Jagersfontein.=--Small town sixty miles south-west of Bloemfontein. In its valuable diamond mine have been found both the largest and the most perfect stones yet discovered. The largest specimen was brought to light in 1893, the most flawless one in 1895.