Uhm this is a bit off-toptic. But the Ottomans did more then the Italians did. (as small nation) it wasn't in Europe but the ottomans did fought against France, and later against Russia with France. Sweden the same, these were Major nations, the small ones shouldn't be, but like only one troop. As like Polish Lancers/infantry for France and Italion and more just special units. Not entire factions for such a small countries
and yes Austria is better knowed overall with units and more. They took part of famous battles. But ask yourself. What If Austria didn't took part on some important battles? Then it would be just as we see Spain in that time.
*Reney, that makes me go for the Spain, they Continue with fighting even they didn't had that much money, or anything like that. But it was the population. That fought, the Austrians got "payed" by the British