The buildings were usually placed in commanding positions for purposes of defence, (b) They were geperally
built by the side of a river, with a moat on the landward side, (r) The main walls were of enormous thickness,
-being from 8 to 12 feet thick, (d) The main walls were surmounted by a parapet at the angles of which look-out
towers were, placed, (e) In the centre of the courtyard, surrounded by a moat, stood a keep or tower several
stories high.
The Norman style is characterized b y : (a) Massive, walls and towers; (b) flat roofs ; (c) narrow holes for
windows; {£) roofs with raised parapets with embrasures ; (e) semi-circular arches.
