SITE O was established by J.E. Kaufmann and Lee Unterborn in the spring of 1998.
The original founding members are numbers 1 through 33. In the autumn of 1998 Kathy Barthen replaced Lee as webmaster and rebuilt the site on a server in Ireland which allowed the site to expand. Since then SITE O grew rapidly and new members included the founders and members of several major associations including the FORTRESS STUDY GROUP (U.K.), COAST DEFENSE STUDY GROUP (U.S.), and LE MUR (France).
In the winter of 1999-2000 Clayton Donnel created a temporary site when it became necessary to move locations again.
In the spring of 2000 Olle Dahlquist took the position as webmaster and rebuilt SITE O on a new server in Sweden.
The membership has continued to grow and we now have members in North and South America, Europe, Asia, Africa and Australia. Many of our members have Internet sites which can be found on the FORTIFICATIONS, ARTILLERY and CASTLE pages. A number of our members have books and pamphlets for sale which can be found on the PUBLICATIONS page. The FORUM is available for anyone to ask questions or post notices. An e-mail newsletter is sent out to members about once a month.