Recently I have been given two folded maps. They have been sent to me from England by a friend who in turn had been given them by a elderly lady a while ago, whose son had "used them during WW1." The first map is "Belgium. Ostend - Sheet 1. Scale 1:100000" Information on the map states " Photo-etched at the Ordnance Survey Office, Southampton. 1911" " Drawn and printed at the War Office. 1911" The map is printed on linen reinforced paper in colour and carries the legend "For official use only." The map references are in English, scales are given, one 1 inch to 1.58 miles and 1 centimetre to 1 kilometre. The second map, larger than the first, also printed on linen reinforced paper in colour, has the title France, Bethune with the additional information, "B" Series (Combined Sheet 36 SE - 36 SW/ 36NE - 36 NW) Second Edition. The map is in French but associated instructions and wordings are in English. We are told that the map has the "Revised System of Squaring." and Revised Contours. The scale is 1: 40000 and is shown in metres although the contour intervals are given in 1000 yards intervals. The initials "O.S.O. 1915" are printed below the bottom RH corner On the reverse side, the back page has translations of features from French to English with a hand penciled identification number , presumably written by a user thus. SM. 5S7 On the reverse side front page with the general description of the map, there is an index showing the available adjoining sheets. Can anyone provide information that would identify these maps? In addition, who would have had access to this type of map and for what purpose? As the second, later map states that it uses a revised system of squaring, it would imply a previous system. Did this revised system of squaring remain in effect, or was this too revised at a later date? Thank you. John. Wisconsin, USA