1SA 13:3

3 Jonathan [and the men who were with him] attacked the Philistine soldiers who were camped at Geba. The [other] Philistines heard about that. [So Saul realized that the army of Philistia would probably come to fight the Israelis again]. So Saul [sent messengers to] blow trumpets throughout Israel [to gather the people together and] proclaim to them, “All you Hebrews need to hear [that now the Philistines will start a war with us]!”