A line of anti-invasion defences, known as the Rhos Llangeler stop line, was constructed during the second World War between Llangrannog and Pembrey. There are several branches. The defences include anti-tank ditches, tank obstacles, roadblocks, mine fields (now cleared) and numerous pill boxes; where suitable, natural features, such as steep slopes and rivers, also formed part of the defences.
B.A.Malaws, RCAHMW, 09 July 2007.