It is proposed to consider only those which were strictly connected with the passage of the stream, and of such there are but three besides Dorchester and Oxford, for that at Cricklade is doubtful, and in any case determines a passage which could be always outflanked upon either side, while the great fortress of the Tower, lying as it does upon the estuarial Thames below bridges, does directly protect a highway.
"The Historic Thames"
Hilaire Belloc
Though it is below bridges it must fall into the scheme of this book, because its whole military history and connection with the story of England is bound up with the inland and not with the estuarial river.
"The Historic Thames"
Hilaire Belloc