Why are all the boys restless at the end of the passage?

At the end of the chapter, Beah foreshadows the tragedy of Junior’s separation during a rebel attack on Kamator. He complains that all his (and the villagers’) labor was for nothing, because “in the end, it all went to ruin, because the rebels did eventually come and everyone ran away” (p. 43). He ends the chapter stating “It was the last time I saw Junior, my older brother” (p. 43).