If you have Chaos and you are struggling with giant massers, then you MIGHT be in luck. This strategy might work 70-90% of the time. If not, then their's nothing else I can do. So, here it is:
Start out with the starting miners mining. Then, get 1 miner( for praying) and 1 crawler. Capture the tower with the crawler and also scout the area. Then either get 2 more miners or get a Juggerknight ( for when the miners are exposed or safety precautions). Usually, the opponent will prepare a large group of giants before attacking and if they do then keep on reading. Get about 7 more miners, so you should have 10 miners( 6 on gold 4 on praying),get the tower spawn for harassing the opponent. Then get about 6-8 deads( w/ poison guts) 6-8 juggs( for tanking), 2-3 marrowkia( for reaping), Medusa( optional), and 1-2 of your own giants( with both giant growth levels).
If the giant masser has a magikill, get a medusa to petrify him so he won't be a bother.
If the giant masser has merics, sometimes I ignore them but if they are a problem, use reaper on them and have some of your juggs or deads to kill them.
If its just giants, should be simple just kill them and use reaper on a few of the E giants.
Like I said i'm not entirely sure about this( plus I forgot a little of it:( ). Hope this helps!
Edit: if no wall or castle archers then take out the enemy miners and destroy his/her statue.