Maps produced for the Italian theatre of operations from British, Italian and Austro-Hungarian series. They include maps used by the Official Historians. The large-scale special Operations Maps (WO 369/753-767) do not have regular sheet-lines or form part of a regular map series. They are historically significant maps, covering the theatre of operations down to Caporetto.
The following map series codes were used for listing 1:75,000, 1:25,000 and 1:12,500 Austro-Hungarian maps:
Series A Topographical maps without "military overprints" which provide the base maps for the other series;
Series B Topographical/operations maps hand-coloured with valleys yellow, roads red and Italian frontiers pink and, where they occur, Austrian defence positions hand-drawn and named in black ink;
Series C Topographical/operations maps with military symbols o/p to locate and identify fortifications and defence works;
Series D Topographical/operations maps with colour-coded trench/gun positions and barracks/camps o/p, [Italian "Trench Lines" in red, Austrian in blue. Listed respectively 'I' or 'A' in 'TL' column of Series List];
Series E Italian topographical maps in Carta d'Italia series reprinted for issue in Austro-Hungarian series.
The above series codes are relevant to these scales, although there are no Series B, C or E maps at 1:25,000. The 1:75,000 maps in the series are in three series, Series A/E, B/C and D.
"Military overprints" of topographical base maps to produce operations series were generally compiled at Armee or Korps Kommando level and drawn/printed by numbered military survey units designated either a 'Kreigsmappierungsabteilung' or a 'Kriegsvermessung' working in the field. All military survey was under the control of the k.u.k [Königlich und kaiserlich = Royal and Imperial] Militärgeographischen Institut in Vienna.
Photographic and drawn panoramas made before 1925 and relating to maps in this series are in WO 369/3 ( "Channels of the Piave" and drawn panoramas) and WO 369/4 ("Various views on Italian Front"). The "photo panoramas" with the prefix 'S' were from the Salonika campaign.
WO 369/1-29 are graphic indexes to the maps.