The second major strategic innovation reported in the fourth book is the account of Brasidas' operations in northern Greece. It is a counterpart to the Pylos operation, both in significance and in narrative technique. But between the Pylos narrative and the story of Brasidas' expedition various other matters are reported. Of these Sicilian affairs are prominent, a natural sequel to the Pylos adventure since, as we are reminded (4.48.6), the expedition on which Demosthenes had sailed had Sicily as its objective.