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In page Gertrud von Hindenburg:

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Sometime in the mid-1870s Gertrud von Sperling met her future husband in Stettin, where he belonged to the General Command of the II Army Corps. On 24 September 1879 the two married in Stettin after Hindenburg's promotion to captain in 1878 had created the material conditions for a marriage. From the union four children were born: Irmengard Pauline (born 14 November 1880 – 1948), an unnamed still-born son (1881), Oskar Wilhelm (31 January 1883 – 12 February 1960) and Anne Marie (born 29 November 1891 in Berlin; died 8 April 1978 in Hanover).[citation needed]