The idea doubtless originated with some officer who felt that he deserved a higher grade than that of Colonel, and could not obtain a Brigadier's commission.
As organization went on, and system prevailed, the "Legions," perhaps according to the merit of their commanders, or their numerical strength, sank into companies, were regularly organized as regiments, or were elevated into brigades. The brigades were from three to seven or eight thousand strong, and all arms of the service were represented in them; they included regiments of infantry and cavalry and batteries of artillery. It was in a measure necessary that this organization should be adopted, from the fact that for some months, each brigade commander was entrusted with supervision and defense of a large tract of territory, and it was impossible to dispense with either of the three arms. Divisions were not organized until late in the fall of 1861--the strength of the brigades was then, to some extent, equalized by the reduction of the larger ones; Army Corps were of still later creation.
A significant custom prevailed of denoting the companies of the first regiments which were raised, not by letter, but by some company denomination which they had borne in the militia organization, or had assumed as soon as mustered as an indispensable _nom-de-guerre_. They seemed to vie with each other in inventing titles of thrilling interest: "The Yellow Jackets," "The Dead Shots," "The Earthquakes," "The Chickasaha Desperadoes," "The Hell-roarers," are a few which made the newspapers of that day, in recording their movements, read like the pages of popular romance. So fondly did the professors of these appellations cling to them, that it was found almost as difficult to compel their exchange for the proper designations, as to effect far more harassing and laborious reforms. The spirit which prompted these particular organizations to adopt this method of distinguishing and identifying themselves, remained to the last characteristic of the Southern troops. Regiments, especially in the cavalry service, were quite as often styled by the names of their commanders, as by the numbers which they properly bore, and, if the commanders were popular, the former method was always the most agreeable.