For the source text click/tap here: Taanit 14
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The Mishna had stated that they would cry out during the last seven fasts.
The Gemora presents a dispute as to the meaning of “cry out.”
Rav Yehuda maintains that they would cry out by sounding the shofar and it was said in the name of Rav that they would cry out by reciting aneinu.
It is evident from this Gemora that shofaros were used on a fast day.
We re-examine the history of communal alarm sounding using trumpets, and the use of the shofar on Shabbat is some communities.