First-off, I'm not concerned with the HRE... I'm speaking of Prussia and Germany, the true forefather to a united Germany.... the HRE crumbled into the Austrian Empire during the time of Napoleon.
I'm sorry, but you go a long-way defending your choice to just end-up using the exact same default flag that comes with Germany in Civ4.
The black maltese cross on a white flag (by itself) just wasn't used as the national or war flag on Prussian warships... I had thought you used it because that's what Firaxis used (which is non-historical for Germany to begin with).
Since there are no "Prussian Civs", we need to think of Germany... the existing flag of the North German Confederation--a horizontal tricolor of black, white and red--became the national flag of united Germany. Black, white and red are said to have been selected by Bismarck in because by combining the colors of Prussia (black-white) and Brandenburg (red-white), they flattered the dynastic sensibilities of King William I of Prussia, a man by no means convinced of the advisability of German unification. Except for minor modifications of the size of the cross, the jack remained unchanged from 1871 to 1919. The commissioning pennant remained unchanged as well, and in fact is still in use nowadays by the German Navy.
I know the tricolor flag of united Germany wasn't used by the Prussians, but neither was the black cross on a white flag for the national flag of Prussia. This was the state flag of Prussia:
Of course, we don't have a "Prussia Civ"... we have a "German Civ"... the first flag of a united Germany was the tricolor naval jack I used. I didn't just make it up out of my head, it's the first unified flag of a unified Germany, and it's seen the most use in the German Navy more then any other flag.
I'm fine with Prussian markings, and I'm not saying you did something horrible by the flag you used (it matches the default "German" flag in Civ4)... but don't try and tell me that it's the actual Prussian naval jack, because it's not. The closest match is the Kriegswimpel, but it's neither the state flag or the naval jack of Prussia.
I didn't expect you to get all defensive by my changing the flag to an actual Naval Jack of Germany... I know it comes a bit late time-line-wise, but it is a historical naval jack, not something fabricated by Firaxis. There's nothing wrong with choice... most people will probably want the DEFAULT Civ4 German flag, but for those that want an actual Naval Jack of Germany that has been in-use for well over 100 years by a united Germany... I give them that option.
It's just an option... I didn't think I was insulting your work, I simply gave another option for those that may want something different... to each their own choice, that's all I was thinking of.
Besides... it matches MY default German flag in my own mod!
Get it?