Destroy the Castle

[OscarW]

Nations are at war! Defend your nation by destroying every castle that stands in the way of your conquest. Victory is only a couple cannon upgrades away.

http://www.nextplay.com/strategy-games/432/Destroy-the-Castle.html

Please use spoilers for hints and walkthroughs:
[spoiler=Title Here]Enter text here...[/spoiler]

Please do not post a video walkthrough for 7 days.

[GameXs]

Even if uprade is only some cannon upgrades , i realy love that one.
Im kinda addicted since i played it the first time