Flemish bases and the geography of war

Flanders was the traditional base and logistical heartland of French naval activity, just as Gascony supplied much of England's maritime strength. De la Cerda therefore operated through the Flemish system rather than sustaining the campaign directly from Castile. His later advancement to Constable of France shows that Winchelsea did not end a capable commander's career. His death is linked here to a decade of French instability, one of several periods when an English victory in the wider war appeared possible. Yet England's chronic manpower disadvantage limited what battlefield success could achieve. English armies were strongest near rivers and coasts connected to home support, whereas movement inland exposed them to France's greater depth and internal logistics. Naval bases and navigable geography help explain the limits of England's land campaigns.