Really? Interesting. I've seen swiss mercenaries as rebels before, but the date for them to be available for hire hasn't come yet. The impetuous bit is a game breaker, because pike don't attack worth crap in this game. They can't maintain formation when attacking and switch to swords. In fact, once I ordered a block of Tercios to march forward; I was just trying to move them close enough to an enemy unit so the pikes would reach. When they got close, the unit suddenly ceased to be a block and became a funnel, with men running in one at a time to melee. I lost half the unit in that fight.