Hennry I had a daughter Matilda who he named as the next ruler of England. But the crown was seized by Stephen her cousin. She fought to keep the crown. One day her son Henry II came of age and continued the fight. He came to relive the forces of Matilda at a castle. When the forces of Stephen and Henny II met they decided not to fight. [That is to say their commanders decided not to have this civil war any longer.] So Stephen and Henry had to meet and talk it over. The decision: Stephen would remain king and after him Henry would be the rightful king of England.

 I have wondered for months what would have happened if in the American Civil War both sides had simply decided not to kill each other? [Maybe there are wars that must be fought. But doubtful wars -like the Civil War seem to me to have been better not to have been fought.]