Louisiana Tigers

Louisiana Tigers was the common nickname for certain infantry troops from the State of Louisiana in the Confederate army during the American Civil War. Originally applied to a specific company, the nickname expanded to a battalion, then to a brigade, and eventually to all Louisiana troops within the Army of Northern Virginia. Although the exact composition of the Louisiana Tigers changed as the war progressed, they developed a reputation as fearless, hard-fighting shock troops.

The origin of the term came from the "Tiger Rifles," a volunteer company raised in the New Orleans area as part of Major Chatham Roberdeau Wheat's 1st Special Battalion, Louisiana Volunteer Infantry (2nd Louisiana Battalion). A large number of the men were foreign-born, particularly Irish Americans, many from the city's wharves and docks. Many men had previous military experience in local militia units or as filibusters. They (and the regiments that later became known as the Tigers) were organized and trained at Camp Moore.

The famous filibuster Roberdeau Wheat, returning from Italy in the spring of 1861, intended to raise a company of New Orleans troops and then a full regiment for Confederate service. And once he proved his mettle in battle, he’d no doubt gain a brigadier’s star. As such, on April 18, 1861, just a few days after U.S. Fort Sumter was attacked by Confederate forces in an expression of their sovereign rights, the New Orleans Daily Crescent carried the following announcement: "We understand that our friend, Gen. C.R. Wheat, is about to raise a company of volunteers, to serve in the Army of Louisiana. His headquarters are on 64 [Saint] Charles [Street], where we advise all friends of a glorious cause to repair and enlist."

...
Wikipedia