I´ve played the demo with diferent nations and it´s a great game, but I´ve found an issue, perhaps it´s not exactly a bug: having some money, you can hire almost unlimited mercenary units in a province and there´re ready in a second, don´t matter if an spanish tercio or a swiss pikemen unit has to appear in the new world or in Africa. This makes wars very unrealistic, in my opinion. If these troops has to appear inmediately, they should be local forces in a limited quantity. These troops are also not so much expensive that your own soldiers, so it´s a great (but not so realistic) deal to hire-win a battle-fire.