'Ost' (iii) was a German undertaking under the leadership of Generalmajor Erich Marcks, chief-of-staff of Generaloberst Georg von Küchler’s 18th Army, to reconnoitre and fi... Read More

'Ost' (iv) was a German operational study by Oberstleutnant Bernhard von Lossberg for the German invasion of the USSR and based on 'Ost' (iii) and later designated as 'Fritz' ... Read More

The 'Ostbau' was a German high-priority programme for the reconstruction and revitalisation of the railway system in the German-occupied parts of the western USSR (October 194... Read More

'Osterei' (i) was a German operation by Generalleutnant Karl Arndt’s 293rd Division, with support from other units, of General Heinrich Clössner’s 2nd Panzerarmee within ... Read More

'Osterei' (ii) was a German and Croat operation, largely by elements of SS-Brigadeführer und Generalmajor der Waffen-SS Karl-Gustav Sauberzweig’s 13th SS Gebirgsdivision 'H... Read More

'Osterei' (iii) was a German programme designed to encompass the assassination of several US leaders, including General Dwight D. Eisenhower, on US soil (1944/45)., The undert... Read More

'Osterglocke' was a German unrealised operation against the forces of Marshal Josip Broz Tito in occupied Yugoslavia in support of 'Maigewitter' (iii) (28/30 March 1945)., Aft... Read More

'Ostern' (i) was a German and Croat operation against the partisan forces of Marshal Josip Broz in the puppet state of Croatia within Axis-occupied Yugoslavia (15/17 April 194... Read More

'Ostern' (ii) was the German withdrawal from the port city of Zadar on the Dalmatian coast of the puppet state of Croatia within German-occupied Yugoslavia (30/31 October 1944... Read More

'Osterripe' was a German long-range reconnaissance in the area of the Aschtachma lake in northern Finland by SS-Brigadeführer und Generalmajor der Waffen-SS Otto Kumm’s 7th... Read More

'Ostfront' was the German naval undertaking against the JW.55B and RA.55A convoys covered by the British 'FV', and leading to the Battle of the North Cape (25/26 December 1943... Read More

'Ostgoten' was the German organisation of home-defence units in eastern Germany as the Soviet forces advanced through Poland toward Germany’s eastern border (1944/45). ... Read More

The 'Ostgoten-Bewegung' was a German undertaking, in accordance with an order of Adolf Hitler, to despatch men combed out of home defence units to reinforce front-line units o... Read More

'Ostmark' was a U-boat wolfpack operation in the North Atlantic against the SC.121 convoy (6/11 March 1943)., The wolfpack comprised U-190, U-229, U-439, U-447, U-530, U-618, ... Read More

This was the German codeword to signal the imminent launch of operations within ‘Weiss’ (i) by General Albert Kesselring’s Luftflotte I in support of Generaloberst Fedor vo... Read More

'Ostpreussen' was a German naval diversionary operation in tandem with 'Westfalen' in support of 'Beowulf II' (12/13 October 1941)., The operation was undertaken by the motor ... Read More

The 'Ostpreussen Staffel' was the German initial maritime movement of some of the troops for the 'Weserübung' assault on Norway in ships supposedly bound for Baltic ports in ... Read More

The 'Ostpreussen-Linie' was a German final fallback position in the area of Klishima on the Eastern Front after the evacuation of the northern part of the 'Büffel-Stellung' b... Read More

'Ostra Brama' was the Polish uprising by the Armia Krajowa (Home Army) in Vilnyus, then technically still a part of Poland, as an element of the 'Burza' Polish national rising... Read More

'Ostrich' was a British unrealised operation by the Special Operations Executive to send two operatives (B. Pedersen and P. Deinboll) into German-occupied Norway to contact No... Read More

The 'Ostrogozhsk-Rossosh Offensive Operation' was a Soviet undertaking by the Voronezh Front against the Hungarian 2nd Army and parts of the Italian 8th Army as the first of t... Read More

'Ostwall' was the German alternative designation for that part of the 'Panther-Wotan-Stellung' on the Eastern Front in the area of Sozh, the Dniepr river and Bryansk (June 194... Read More

The 'Osutoraria' plan was the supposed, but highly improbable, Japanese scheme for an invasion of Australia (1941/March 1942). , Early in 1942 elements within the Imperial Jap... Read More

'OT' (i) was the designation of Allied convoys (together with a numerical and sometimes a literal suffix) plying the route from Curaçao, Netherlands West Indies, to Trinidad,... Read More

'OT' (ii) was the Allied designation of tanker convoys plying the route from North Africa to the Dutch East Indies in the period after 'Torch', and as such reciprocals of the ... Read More

'OT' (iii) was the designation of US convoys (together with a numerical suffix) plying the route from New York to the Caribbean (Aruba or Curaçao in the Netherlands West Indi... Read More

'Otsu' was a Japanese operational study for a major war with the USSR to be undertaken in the northern half of Sakhalin island and in that part of continental Siberia as far t... Read More

'Ottawa' was a Canadian unrealised attack on the German position at Carpiquet, to the west of Caen in Normandy, in the event that 'Epsom' proved successful (late June 1944)., ... Read More

'Otter' was an Allied pair of exercises ('Otter I' and 'Otter II') in preparation for 'Neptune' (iii) and 'Overlord' (15 and 19 March 1944). ... Read More

'Otto' (iii) was the German original codename under which the invasion of the USSR was planned for implementation in May 1941 (June/5 December 1940)., The plan was later modif... Read More

'Otto' (iv) was a German and Croat operation against the partisan forces of Josip Broz Tito in the puppet state of Croatia in Axis-occupied Yugoslavia (19/21 April 1943)., The... Read More

'Otto' (v) was a German undertaking to destroy a partisan force of some 2,000 men in the area just to the north of Tepelenë in Albania (1/7 December 1943). ... Read More

This was a German operation against partisans in the Belorussia region of the German-occupied western USSR (12 December 1943/1 January 1944). ... Read More

The 'Otto-Programm' was the German effort outlining the railway and road upgrades which would have to be effected, largely in East Prussia and German-occupied western Poland, ... Read More

'Ottrington' was the Allied plan to deceive the Germans as to their intentions as they prepared their 'Olive' (iii) offensive against the 'Gotisch-Linie' defences (summer 1944... Read More

'Ouessant', which is also known as the Battle of Ushant or the Battle of Brittany, was a naval engagement between German and Allied destroyer flotillas off the coast of Britta... Read More

'Outdistance' was a British special forces liaison mission to parachute a three-man team into the Telc area of German-occupied Czechoslovakia to plant a 'Rebecca' homing beaco... Read More

'Outflank' was a British carrierborne air attack on Japanese military installations and oil facilities at Belawan Deli on the island of Sumatra in the Japanese-occupied Nether... Read More

'Outing' was a British pair of naval undertakings ('Outing I' and 'Outing II') against German shipping in the Aegean Sea (14/20 September and 27 September/20 October 1944). , ... Read More

'Outmatch' was a British programme of air patrols by de Havilland Mosquito heavy fighters in the Bay of Biscay to tackle German bombers, especially those carrying anti-ship mi... Read More

'Outstep' was a British programme of long-range fighter patrols off the west coast of German-occupied Norway to escort anti-ship strike missions by attack aircraft of Air Chie... Read More

'Outward' (i) was a British balloon offensive against Germany (20 March 1942/4 September 1944)., In this period the British launched 99,142 balloons, 53,343 of them each carry... Read More

'Outward' (ii) was a British naval undertaking to intercept and destroy German convoys off the coast of the German-occupied Netherlands in the area of the Hoek van Holland (Ma... Read More

'Overcast' was the Allied early designation of the US undertaking later known as 'Paperclip' (spring/summer 1945). ... Read More

'Overdrive' was an Allied unrealised plan for the deployment and steady enlargement of a significant striking force of British and US air units in the Caucasus region of the s... Read More

'Overjoyed' was a British operation by the aircraft of Air Vice Marshal F. L. Hopps’s No. 16 Group of Air Chief Marshal Sir William Sholto Douglas’s RAF Coastal Command in... Read More

'Overlord' was the Allied invasion of Normandy in north-western France up to the time of the break-out and advance to the line of the Seine river (6 June/19 August 1944)., The... Read More

'Oversight' was a British component of 'Ration' (22 November 1940/1942). ... Read More

'Overthrow' was an Allied deception plan designed to persuade the Germans that the Allies were planning to launch amphibious landings against Calais and Boulogne in German-occ... Read More

'OW' (i) was the designation of Allied convoys (together with a numerical suffix) plying the route between the UK, India and Australia, together with intermediate destinations... Read More