George Thomas Clark, Mediæval Military Architecture in England…
“ An Edwardian gatehouse is a very imposing structure. It was usually rectangular in plan, always flanked in front by two drum towers, and sometimes in the rear by two others containing well-staircases. In its centre was the portal arch opening into a long straight passage traversing the building. Three loops in each flanking tower commanded the bridge of approach, raked the lateral curtain, and covered a point immediately outside the gate. ”
