Each milecastle on Hadrian's Wall had two associated turret structures. These turrets were positioned approximately one-third and two-thirds of a Roman mile to the west of the Milecastle, and would probably have been manned by part of the milecastle's garrison. The turrets associated with Milecastle 71 are known as Turret 71A (grid reference NY33355913) and Turret 71B (grid reference NY32895914). None of the turrets between Milecastles 59 and 72 were sought or identified prior to 1961, and the exact locations of turrets 71A and 71B are uncertain.