to what extent can you see the urge to control by the use of force in the behaviors of henry, maurice and roger?

We see this especially in chapter 4. Roger and Maurice, come out of the forest for a swim and, expressing their superiority over the littluns, begin to kick down the sand castles on the shore. Maurice, remembering that his mother chastised him for such behaviour, feels guilty when he gets sand in Percival's eye. Roger aims at the little boys but aims to miss. The old life holds him back. Still it is an excercise in exacting control over the weak. This can even be seen among the littluns. Henry throws sand in Percival's face, exacting his own control over the weaker littlun.