[Footnote 86: For the Roman trumpet, and its various notes,
consult Lipsius de Militia Romana, (Opp. tom. iii. l. iv.
Dialog. x. p. 125-129.) A mode of distinguishing the charge
by the horse-trumpet of solid brass, and the retreat by the
foot-trumpet of leather and light wood, was recommended by
Procopius, and adopted by Belisarius.]