At this signal the regiments take “right shoulder shift,” and the march begins. Let the reader, in imagination, take post by the roadside as the column goes by. Take a look at corps headquarters. The commander is a major-general. His staff comprises an assistant adjutant-general, an assistant inspector-general, a topographical engineer, a commissary of musters, a commissary of subsistence, a judge-advocate, several aides-de-camp—and perhaps other officers, of varying rank. Those mentioned usually ranked from colonel to captain. In the Union army, major-generals might command either a division, a corps, or an army, but in the Confederate service each army of importance was commanded by a lieutenant-general. Take a look at the corps headquarters flag. Feb. 7, 1863, General Hooker decreed the flags of corps headquarters to be a blue swallow-tail field bearing a white Maltese cross, having in the centre the number of the corps; but, so far as I can learn, this decree was never enforced in a single instance. Mr. James Beale, in his exceedingly valuable and unique volume, “The Union Flags at Gettysburg,” shows a nondescript cross on some of the headquarters flags, which some quartermaster may have intended as a compliance with Hooker’s order; but though true copies of originals they are monstrosities, which never could have had existence in a well ordered brain, and which have no warrant in heraldry or general orders as far as can be ascertained. When the army entered upon the Wilderness Campaign, each corps headquarters floated a blue swallow-tailed flag bearing its own particular emblem in white, in the centre of which was the figure designating the corps, in red. Here comes the First Division. At the head rides its general commanding and staff. Behind him is the color-bearer, carrying the division flag. If you are familiar with the corps badges, you will not need to ask what corps or division it is. The men’s caps tell the story, but the flags are equally plain-spoken. This flag is the first _division_ color. It is _rectangular_ in shape. The corps emblem is red in a white field; the _second_ has the emblem white in a blue field; the _third_ has the emblem blue in a white field. The divisions had the lead of the corps on the march by turns, changing each day. But here comes another headquarters. The color-bearer carries a _triangular_ flag. That is a _brigade_ flag. May 12, 1863, General Hooker issued an order prescribing division flags of the pattern I have described, and also designated what the brigade flags should be. They were to be, first of all, _triangular_ in shape; the brigades of the first division should bear the corps symbol in _red_ in the centre of a _white_ field, but, to distinguish them, the first brigade should have no other mark; the second should have a _blue_ stripe next the staff, and the third a _blue_ border four and one-half inches wide around the flag.