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In page Bombing of Dresden:

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A large scale aerial attack on Berlin and other eastern cities was examined under the code name Operation Thunderclap in mid-1944, but was shelved on 16 August.[4] This was later reexamined, and the decision made to pursue a more limited operation.[5] The Soviet Army continued its push towards the Reich despite severe losses, which they sought to minimize in the final phase of the war. On 5 January 1945, two North American B-25 Mitchell bombers dropped 300,000 leaflets over Dresden with the "Appeal of 50 German generals to the German army and people".[citation needed]