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1. In 1918, Operation Blücher was an alternate plan to Heilger Michael. It called for an attack on Allied forces near the Aisne River, scheduled for spring 1918. It is also known as Third_Battle_of_the_Aisne, see Spring_Offensive#Bl.C3.BCcher-Yorck for its context during the spring offensive
2. In 1942, Operation Blücher was planned as a five-division attack from the Crimean Peninsula across the Kerch Straits into the Caucasus, as part of Operation Blau. It was executed in a much smaller form on 2 September 1942.