You need to fire a man up to the bell - to do this the arrow must be facing right, and a rock fired up there - click on the arrow as the rock bounces off the bell - this makes the rock land near - but not on the arrow.
Then when all missiles are gone you can put a man into the cannon - then make that man push the frame to the right by clicking on him, once over - click on the bell a few times so it falls onto the arrow - the rock jumps up and blows the bomb up!
before u click on the door to bring the 2nd guy out click on first guy after all bombs have been used he then gets tipped into cannon fire him up 2 ledge making sure 2 click spear so it dosent splat him. oh u have 2 bring another man out of trapdoor 2 fire him up.ill let u do the rest though