The Spirit of God came upon Saul, inspiring him suddenly with more than ordinary courage, and zeal, and resolution, to engage himself and the people for their rescue. Compare Judges 3:10, Judges 6:34 11:29. His anger was kindled greatly against Nahash, for so insolent and barbarous a proposition.
Related Commentaries of 1 Samuel 11:6
1 Samuel 11:6
6 And the Spirit of God came upon Saul when he heard those tidings, and his anger was kindled greatly.