The best reference I know is an article by my son:
Peter Krentz, "The SALPINX in Greek Battle," p[p. 110-120 in _Hoplites: The
Classical Greek Battle Experience._ Ed Victor Davis Hanson. London and New
York: Routledge,1991. [reprint in paperback now out] ISBN 0-415-04148-1.
You will find many references to classical history that illustrate the
various uses of the instrument in warfare. It's a good article, even if a
"proud father" says so.
Incidentally, what you cite from Vines Expository Dictionary is not a
definition, but a descriptive interpretation.
The trumpet was also used in parades, in triumphs, etc.
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