I am currently working on the killed, mortally wounded, and wounded NCOs and soldiers of the 57e Ligne. This is one of the first I have come across that name a smaller field hospital. The majority of the men died in Strasbourg, Neubourg ( Normandy France?) most likely Neuburg (Bavaria), Kaisersheim, Augsburg, or Höchstadt hospitals.
2e Grenadiers Caporal Jean Remi Augustin Dujardin: Died of wounds at N.1 hospital on the Danube in Ingolstadt 26 April 1809
the picture below
Another fusilier named Jerome Foztunato from the same battalion died of wounds received at the Battle of Thann in hospital N.2 in Ingolstadt on 9 May 1809.
I can only guess that their wounds were too serious to transport them to a larger hospital further away from the fighting.
Ingolstadt was then an important fortress