The material in the line, then, was as good as could be; the weakness was in the officers, and it was here that the sifting was necessary. Most of these officers had themselves enlisted as privates, and their patriotic zeal was not to be questioned. They had been chosen to be lieutenants, captains, and even colonels by their men because of faith in their ability to lead, or to recognize their influence in raising the troops. Yet a considerable part of them proved incompetent to command. The disqualifications were various. Some lacked physical strength and stamina. Some had or quickly developed intemperate habits. Some lacked the education and intelligence needful for official responsibility. Some were too indolent to apply themselves to the work of disciplining themselves or their men. Fitness for command is a very general term, yet it implies a set of qualities which intelligent people easily understand and attach to the phrase. Self-command is proverbially one of the chief. Courage and presence of mind are indispensable. Ability to decide and firmness to stick to a decision are necessary. Intelligence enough to understand the duties demanded of him and to instruct his subordinates in theirs is another requisite. But beside all these, there is a constitution of body and mind for which we can find no better name than military aptitude. For lack of it many estimable, intelligent, and brave men failed as officers. Again, not every good captain made a good colonel, and not every good brigade commander was fit for a division or a larger command. There was a constantly widening test of capacity, and a rapid thinning of the numbers found fit for great responsibilities until the command of great armies was reached, when two or three names are all that we can enumerate as having been proven during the four years of our civil strife to be fully equal to the task.