Wing 1
AOE, Easy
Wing 2
AOE, control the mines.
Wing 3
AOE, control the mines and chests.
Stop spending money when bolvar casts the aura(?) to restore towers, because it will kill all units in the aura region. At that time, take over the weakest tower asap.
Whelp eggs with flame burst is a good option to counter the footmen squad with a crossbowman because whelp eggs hatching will kill the annoying crossbowman.