Hello!

I have a question regarding the keep/castle/ lumber mill and refinery. They all give bonus resources. I have my lumber mill up and I'm getting +25 lumber. Is the peasant collecting more wood, or is the mill itself somehow adding more lumber? I want to know this because if the peasant is collecting more wood, that would mean a natural wall would be cut down faster which would alter some strategies on certain maps/levels.

Based on official page it adds the bonus resource, so it looks like it is not affecting wood tile:
"It also adds 25 worth of Lumber to every peasant's trip, which is really useful early in the game."
http://classic.battle.net/war2/basic/hbuildings.shtml

Thanks!