Mackay's Regiment: A Narrative Of The Principal Services Of The Regiment From Its Formation In 1626, To The Battle Of Nordlingen, In 1634 is a historical account that narrates the regiment's activities from its formation in 1626 to the Battle of Nordlingen in 1634.

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'Although Munro in his Expedition does not say anything on the subject, I think I am safe in assuming that the kilt was the great distinguishing dress of the Regiment. Grant, in his Memoirs of Sir John Hepburn, makes frequent mention of "Mackay's Kilted Highlanders;" and in Philip Rollo he thus describes the Regiment:-"The whole were uniformly accoutred in steel caps and buff coats, the officers being fully armed in bright plate to the waist, and having plumes in their head-pieces; their kilts were of dark green tartan, and belted up to the left shoulder, according to the custom of Highlanders when going on service. The musketeers carried their powder in bandoliers; and, in addition to his dirk, every officer and man wore the claymore or genuine old Highland sword, which could be used with both hands. Their purses were of white goatskin, and properly adorned with silver." "The officers are said, in addition to rich buttons, to have worn a gold chain * '