I was trying to blockade allies to skim a little profit from some of their coastal cities. They were long-term allies that I had all positive marks with, in both cases over +25 positive with no negative, (well, I had -1 for Napoleon for refusing to switch civics). Anyhow, both of my former allies declared war on me instantly when I blockaded the first port! But, that would mean they KNEW the privateer was mine, but that's not the way it works is it?