1 Samuel 23:8

And Saul called all the people together to war
Or "caused [them] to hear" ^F13 summoned them by an herald, whom he sent into all parts of the kingdom to proclaim war, and require them in his name to attend him; which was the prerogative of a king to do:

to go down to Keilah, to besiege David and his men;
that was what he privately intended, but the pretence was to make war against the Philistines.