Everyone says that if you pause the game and click on a building (E.G. A cathedral)you'll get whatever it cost to build, back into your stockpile. It doesn't work on my computer so I was wandering if it was real. (P.S. Is it because Iv'e got stronghold 2 deluxe?)

Always use archers, abviously, and put lots of towers, the higher they are, the farther they can shoot. Also, use the rolling logs, pits, and traps, they may be expencive, but worth it