This complex of underground tunnels was built in the 1940s and served as Brigade headquarters for the South East Army Command; it was manned by Canadian troops.  Other similar bases were also established at Reigate, Canterbury and Tunbridge Wells. At Sarre, the complex consists of three parallel stairways excavated into the chalk.  These lead downwards for fifty feet before the main areas of tunnels and rooms are reached.

All three entrances were blocked at the end of the war, but in more recent years they have all been bulldozed and their exact location is now unknown.