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In page Paul von Hindenburg:

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Hindenburg would later judge German operations in 1915 to be "unsatisfactory". In his memoirs, he recounted that "[t]he Russian bear had escaped our clutches"[6] and abandoning the Polish salient had shortened their lines substantially. Conversely, victorious Falkenhayn believed that "The Russian Army has been so weakened by the blows it has suffered that Russia need not be seriously considered a danger in the foreseeable future".[7] The Russians replaced their experienced supreme commander, Grand Duke Nicholas Nikolaevich, a man whose skill Hindenburg held in high regard,[8] with the Tsar.[citation needed]