וְכִֽי־תָבֹ֨אוּ מִלְחָמָ֜ה בְּאַרְצְכֶ֗ם עַל־הַצַּר֙ הַצֹּרֵ֣ר אֶתְכֶ֔ם וַהֲרֵעֹתֶ֖ם בַּחֲצֹצְר֑וֹת וֲנִזְכַּרְתֶּ֗ם לִפְנֵי֙ יְהוָ֣ה אֱלֹֽהֵיכֶ֔ם וְנוֹשַׁעְתֶּ֖ם מֵאֹיְבֵיכֶֽם׃
Y cuando viniereis á la guerra en vuestra tierra contra el enemigo que os molestare, tocaréis alarma con las trompetas: y seréis en memoria delante de SEÑOR vuestro Dios, y seréis salvos de vuestros enemigos.
Mishnah Rosh Hashanah
On [public] fast days they used shofars of rams, curved, the mouths of which were covered with silver, and there were two trumpets in between them. A short blast was made with the shofars and a long one with the trumpets, because the mitzvah of the day is with trumpets.