The firearm you mentioned isn't a jaguar. It's a jaeger, or jäger, pronounced "yey-ger".

The literal definition of a jäger is a hunter. It came to be applied to light infantrymen of Austrian, German, Scandanavian and Russian military commands during the Napoleonic Wars.
http://en.wikipedia.org/wiki/Huntsmen_(military)
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The French term better known in Louisiana would be Chasseurs � pied.

During WWII the term "jäger" appeared frequently in names such as fallschirmjäger (paratrooper, or "hunters from the sky"), gebirgsjäger (mountain infantry) as well as panzerjäger, the name given to German anti-tank arms and vehicles --

Here's a good article by Joe Bilby on the Austrian Jäger rifle during the Civil War --
http://www.civilwarguns.com/9901b.html