My grandfather, Bozo Plecas, was from Divoselo/Gospic in Croatia which was a part of Austro-Hungary. He served in the Austrian army during WW1. I'd like to find information that is available on his service.

Additionally, my great-great-grandfather, Janko Rajcevic (from the same place) served in the Austrian army during the mid 19th century. He died at the Battle of Solferino in 1859. I'd also like to find info on his service.

Any and all suggestions are warmly welcomed. Thanks.
Bodie