Whilst this site is primarity concerned with the forces of the Kingdom of Italy, I do turn up the odd piece of information about other nations which it seems a shame not to share. This part of the site deals with those nations that Italian forces often had to fight.
Much of the territory that went into the Kingdom of Italy was seized from the Austrians as a result of Napoleon's campaigns. They made several attempts to reclaim this land, forcing the Italians to defend their new country. Here are a couple of Austrian resources: