What does 1 Samuel 13:3 mean?

Jonathan attacked the Philistine outpost at Geba, and the Philistines heard about it. Saul had the trumpet blown throughout the land, saying, 'Let the Hebrews hear!' 1 Samuel 13:3 - Modern Text Bible

(Jonathan initiates a conflict by attacking a Philistine garrison, and Saul spreads the news to rally the Israelites.)