1. Stone built modified type 26, turf topped. Simple brick ricochet wall. Built inside a Roman marching camp.
[Recorder John Harding gives type 24 pillbox at SH 66065573]. Record derived from Defence of Britain Project (Record Number 3234)

2. The monument consists of anti-invasion defences, dating to the early period of World War II (AD1940-41), that formed part of Western Command Stop Line No. 23, which ran from Bangor to Portmadoc. The two northern pillboxes act as a pair and cover the A498 to the N. The southern pair defend the road to the Llanberis Pass and the head of Nant Cynnyd valley respectively. The pillboxes are built of concrete and possess sunken entrances. Locally sourced exterior stone walsl and the use of grass banks and roof coverings provide comouflage through concealment.
Source: Cadw scheduling description of August 2006. F.Foster/RCAHMW 02.10.2006
See also NPRNS 270346;270348 and 270421