18de Bataillons Historie 1785-1885 by E. Neergaard & J. K. P. L. Pontoppidan. Copenhagen: K. Schønberg, 1885. 260 pages:

http://books.google.com/books?id=5CdEAAAAYAAJ

A nice Danish unit history - 2den Bat. Sjaellandske Jaegerkorps during Nap Era.