Paul von Hindenburg - Wikipedia

On September 18, 1914, General Paul von Hindenburg was named commander of German armies on the Eastern Front. From the article:

"Hindenburg retired from the army for the first time in 1911, but was recalled shortly after the outbreak of World War I in 1914. He first came to national attention at the age of 66 as the victor of the decisive Battle of Tannenberg in August 1914. Upon being named Germany's Chief of the General Staff in August 1916, his popularity among the German public increased exponentially to the point of giving rise to an enormous personality cult. As Kaiser Wilhelm II increasingly delegated his power as Supreme Warlord to the German high command, Hindenburg and his deputy Erich Ludendorff ultimately formed a de facto military dictatorship that dominated German policymaking for the rest of the war.

Hindenburg retired again in 1919, but returned to public life in 1925 to be elected the second President of Germany. In 1932, Hindenburg was persuaded to run for re-election as German President, even though he was 84 years old and in poor health, because he was considered the only candidate who could defeat Hitler. Hindenburg was re-elected in a runoff. He was opposed to Hitler and was a major player in the increasing political instability in the Weimar Republic that ended with Hitler's rise to power. He dissolved the Reichstag twice in 1932 and finally, under pressure, agreed to appoint Hitler Chancellor of Germany in January 1933. Hindenburg did this to satisfy Hitler's demands that he should play a part in the Weimar Government, since Hitler was the leader of the Nazi party which had won the largest plurality in the November 1932 elections (no party achieved a majority). In February, he signed off on the Reichstag Fire Decree, which suspended various civil liberties, and in March he signed the Enabling Act of 1933, which gave Hitler's regime arbitrary powers. Hindenburg died the following year, after which Hitler declared himself Führer und Reichskanzler, or Supreme Leader and Chancellor, which superseded both the President and Chancellor."