What does 1 Samuel 13:4 mean?

All Israel heard the news: 'Saul has attacked the Philistine outpost, and now the Philistines hate us!' The people were called to join Saul at Gilgal. 1 Samuel 13:4 - Modern Text Bible

(The people realize they're now in open conflict with the Philistines, and Saul gathers them at Gilgal for battle.)