Defences were built before 914 at Hereford, and probably Shrewsbury and two other fortresses, at Scergeat and Weardbyrig, which have not been located.
Pada 914, struktur pertahanan juga dibangun di Hereford, dan mungkin juga Shrewsbury dan dua benteng lain, "Scergeat" serta "Weardbyrig", yang lokasinya tidak diketahui saat ini.