Finnish Military Records, 1812-1905
The National Archives of Finland, Arkistolaitos, has Finnish Military Records free, online, for the years 1812-1905. They’re only in Finnish so non-Finnish speakers will need to use Google Translate to aid their searches.
Here’s a translation of the search page:
“Find data by entering optional search term in the box below. Search service finds all the digital archive creator, archive, series and archive services, which in the name of your search term is mentioned. You can also search for data using a tree view of a digital archive.