here is some tip that im gunna tell you..
if someone's trying to attack you.. you dont know if he gunna occupy your castle or he choose plunder mode.. if that happens..
move all your resources in the city that they're not attacking so that when they Plunder you .. they can only take a little resources from your castle.. if that always happen they just gunna stop plundering or maybe attacking you.. So Build alot of Cargo ship Specially when you are a commercial type..
This one im gunna tell you how to hide your Golds from enemy..
First Go To Alliance Market and click the lvl 3 parts/gear then choose any Parts/Gear and buy it all.. i know that even the highest Commercial rank in our alliances..he cant still make a lvl 3 Parts/Gear so no one gunna Sell you those parts.. After The attack you can Cancel the Trade and all your money is yours again..
Guys i hope this will help you..