Although within marching distance of the battle, the heavy snow had muffled the sound of gunfire and Ney was completely unaware of events until the messenger reached him around 14:00.
The twin battles of Jena and Auerstedt (older name: Auerstädt) were fought on October 14, 1806 on the plateau west of the river Saale in today's Germany, between the forces of Napoleon I of France and Frederick William III of Prussia.
Further north, in the vicinity of Auerstedt, was Bernadotte's I Corps (20,000 strong) and Davout's III Corps (27,000).
Bernadotte was severely censured and came within an ace of being dismissed on the spot — despite being within earshot of Auerstedt and within marching distance of Jena, he ignored his orders and did not fire a shot in either battle.