My problem with Redoubt is that it isn't particularly Era or location specific. It's just a generic military term, which can apply to virtually any period of history. In short, it has little to do with the theme of the Age of Empires.

At least parliament, while not militaristic, fits the bill of applying to the era much better.

To be honest some of Fisherking's suggestions sound much better, a shame that they didn't get the votes.

Also we don't have to pick a military name just because the others are! Buck the trend people! Be different!

Also diplomacy should be much more prominent in Empires, as should the system of government, so Parliament is a good way of showing that.

Also we could all pretend to be MP's (that's Members of Parliament, for anyone who isn't familiar with British government).