Campaign Mode strategy: Refer to the image for the initial build sequence. Have your two Heroes (Fee ad Lancelot) positioned as seen on the image. This will tremendously help tank the incoming horde from the two entries above (top and upper left). The barracks near the base is there to clean up anything that might pass through your initial defense.
Prioritize on upgrading your cannon to its fullest (with rockets), followed by upgrading your barracks to render your troops with better resilience and increased damage. Remember to use Lancelot’s defense buff to maximize the longevity of your troops, and Fee’s Feral Summon to add in to your damage dealers. Follow up a build of a cannon on the lower right section of the map, and an archer tower beside it. Fully upgrade them. Add in some additional ground soldiers by building a barracks on the build site at the bottom.
They would serve as a tank for those coming from below so that your archer tower and cannon can obliterate them in clusters. Try to build another archer tower on the site beside the barracks near to your base – to trim down the forces that passes through your first line of defense on top. Win the game with three stars!
Legendary strategy: Position you Heroes on the bottom lane of the “S” road. Build a wizard tower, fully upgraded with the haste buff and beside it, a barracks to choke the line. Put the troops at the bottom, along with Lancelot to hold the line. Position Fee and Bolton in the grass area to keep them out of reach. Secure another barracks at the bottom and an archery tower near your base to shave of the horde coming from the top. Fully upgrade them.