They wanted their children to be free
To the Anglo-Saxons and the Celts, the word free meant dear. They used it to describe persons who were close to them, and not slaves. They wanted the person dear to them to be free, because they valued liberty of action. The word liberty comes from the Latin word that means children. Most of all Brits wanted their children to be free.
The Brits who loved freedom and justice and were willing to stand up for it were adventurous. They were inspired by ideas. They can be found here.