Sieged 2

[GamersHood]

Dwarf is back! And his castle is still under siege! Your castle is under siege! Use your brain and everything else to stop the enemies. Drop boxes, wheels and cannonballs directly on their heads or activate bombs and sophisticated mechanisms to knock out bad guys.

Play here: http://www.gamershood.com/17867/puzzle/sieged-2

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

Please do not post a video walkthrough for 7 days.