As France, I started a bloody ten year war, and ended up completely decimating Spanish armies, and took the lucrative gold-producing provine of Toledo for France, along with Flanders.
During the course of the war, troops from Cologne and the Platinant repeatedly went on rampages through the French countryside, always ending up in Northern Spain (their apparent destination all along). Spanish troops did a similar thing, except they went teh opposite direction (from Spain into Germany). I sent out the French navy repeatedly, but there was not a sign of a Spanish ship anywhere (for 10 years, not one naval engagement).
Savoy managed to end up taking Havana from the Spanish. Later, I conquered the entire Aztec Empire, for France, but returend a few years later to find that my Aztec colonies had turned Spanish, even though I got not warning, nor was there a delcaration of war.