The Munich Beer Hall Putsch was an attempted coup led by Adolf Hitler in November 1923. He planned to gather military support in Bavaria and then march to Berlin, and the government in revolution (1). Hitler and his Nazi supporters,who also included Ludendorff and other high ranking people, took control of a meeting in Munich, declared a "national revolution," and the next day they marched into the city with 200 SA troops, but their attemted takeover was easily crushed by Bavarian police. HItler was given a prison sentence, although he was let off early after only 10 months (2). This Putsch, although a failure, set the stage for the Nazi takeover almost a decade later.

Aftermath of the Putsch:
~encouraged the Weimar Democracy because it withstood a dangerous threat in what was a difficult year.
~ Hitler was sentenced to mere five years in prison (which is the minimum time for treason). he was released only after 10 months.
~Ludendorff was acquitted on the grounds because although he was there during the putsch, he was there by 'accident'
(obtained from The Threats to Weimar 1919-23)

1 Layton, Geoff. Weimar and the Rise of NaziGermany. 3rd edition. London. Hodder, 2005. Chapter 6 pg 4
2 Layton 4-5