The Battle of Tannenberg Line (German: Die Schlacht um die Tannenbergstellung; Russian: Битва за линию «Танненберг») or the Battle of the Blue Hills (Estonian: Sinimägede lahing) was a military engagement between the German Army Detachment Narwa and the Soviet Leningrad Front. They fought for the strategically important Narva Isthmus from 25 July–10 August 1944. The battle was fought on the Eastern Front during World War II. The strategic aim of the Soviet Estonian Operation was to reoccupy Estonia as a favorable base for the invasions of Finland and East Prussia. Waffen-SS forces included 24 volunteer infantry battalions from the SS Division Nordland, the SS Division Langemarck, the SS Division Nederland, and the Walloon Legion. Roughly half of the infantry consisted of the personnel of the 20th Waffen Grenadier Division of the SS (1st Estonian). The German force of 22,250 men held off 136,830 Soviet troops. As the Soviet forces were constantly reinforced, their overall casualties are estimated by Estonian historian Mart Laar to be 170,000 dead and wounded.
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Leningrad Front in the context of Army Group Courland
Army Group Courland (German: Heeresgruppe Kurland) was a German Army Group on the Eastern Front. It was created from remnants of the Army Group North, isolated in the Courland Peninsula by the advancing Soviet Army forces during the 1944 Baltic Offensive of the Second World War. The army group remained isolated in the Courland Pocket until the end of World War II in Europe. All units of the Army Group were ordered to surrender by the capitulated Wehrmacht command on 8 May 1945.
At the time agreed for all German armed forces to end hostilities (see the German Instrument of Surrender, 1945), the Sixteenth and Eighteenth armies of Army Group Courland, commanded by General (of Infantry) Carl Hilpert, ended hostilities at 23:00, on 8 May 1945, surrendering to Leonid Govorov, commander of the Leningrad Front. By the evening of 9 May 1945 189,000 German troops, including 42 officers in the rank of general, in the Courland Pocket had surrendered.