Map (in German language) showing the last phase of the <a href="https://en.wikipedia.org/wiki/Battle_of_Grundwald" class="extiw" title="en:Battle of Grundwald">Battle of Grundwald</a> (or Tannenberg) on July, 15th 1410.
<a href="//commons.wikimedia.org/wiki/User:Memnon335bc" title="User:Memnon335bc">Memnon335bc</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>