Well if this was a simlation I could see their point.

You've essentially handed their ass to them using musket lead, European tactics, guy's on horses with a bad attitude and those bloody great iron things on wheels.

To them it sounds like hell on earth when you attack and guess what...

The Spanish over the road have all of the same stuff.

I'm wondering if they get the feeling they could get their asses handed to them a second time?

On the other hand, maybe one or two stacks could test out the Spanish resolve and see if they cave in like they were known to do back then.