I propose that the usual role of the Notitia Dignitatum's ‘Saxon Shore’ forts was, on both sides of the Channel, to control chronic, ‘everyday’ piracy and to support imperial operations. An exception occurred under Carausius and Allectus when the British forts were augmented to face likely Roman invasion. There was never any integrated cross-Channel system against concerted barbarian seaborne attack, Saxon or otherwise. The ‘Saxon Shore’ was a late fourth-century political expedient, confined to Britain and with minor military significance.
