The Battle of Allenstein (or Olsztyn), also known as the Battle of Jonkowo (or Jankowo, Inkowo, Jonkendorf) and the Battle of Bergfriede, was a military engagement during the early stages of the 1807 Fourth Coalition Napoleonic campaign. While the battle resulted in a French field victory and allowed for a successful pursuit of the Russian army, it failed to produce the decisive engagement that Napoleon was seeking.
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