from the book "THE PRINCIPLES OF MASONIC LAW"
A Treatise on the Constitutional Laws, Usages And Landmarks of Freemasonry
by Dr.Albert Gallatin Mackey, 1856
The Grand Marshal, as an officer of convenience, existed from an early period. We find him mentioned in the procession of the Grand Lodge, made in 1731, where he is described as carrying "a truncheon, blue, tipped with gold," insignia which he still retains. He takes no part in the usual work of the Lodge; but his duties are confined to the proclamation of the Grand Officers at their installation and to the arrangement and superintendence of public processions.
The Grand Marshal is usually appointed by the Grand Master.