To help you in defending the Castle, would be a team of Wizards, Archers and Craftsmen. One good thing about this On-Line game is, you can save and reload at the Level which you last played.
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This is after Level 15, and its time to upgrade my Walls
This is Level 17, where you have Giants and bettering rams
If you do not have Wizards and the Mana Pool, the Giants will
demolish your Castle Archers can get at them but they are just
not that fast enough
This is Level 32, where I keep on converting the Barbarians
as my Wizards, Archers and Craftsmen. I have everything
I need now, so, I just play, and the Castle will defend itself
This is Level 42 and I have upgraded the wall defense to 30,000
Which is just as well as the suicide bombers are coming thick and fast