There are a lot of Spring Traps and Bombs in the entrances of the village.
【Notice】Actually, you cannot see the traps on the screen at first.
In order to take out traps in the entrances, deploy some Goblins on each point A in the following picture. If you don't want to use them, you can use Barbarians.
After the traps are gone, drop 20~30 Barbarians on each point A to take out Archer Towers. Some of them attack not Archer Tower but other buildings. However, you don't need to take care.
Some Barbarians will be defeated by Mortars and Cannons, so add 20~30 Barbarians on each point A.
After Archer Towers are gone, deploy a Balloon. You can use Giant to take out Archer Towers, but they cost a lot.
In the following video, Barbarian and Giant are upgraded to level 4. Balloon is upgraded to level 3.
To remove traps in a entrance, the player in the video drop 5 Barbarians one at a time.
Same as above, the player put in 5 Barbarians one by one in order to take out traps.
After the traps are gone, the player drop 6 Barbarians on each entrance. They start to attack Archer Towers.
While defense buildings such as Cannons and Mortars are attacking Giants, the player deploy 5 Barbarians.
After Archer Towers are gone, the player deploy 3 Balloons. Giants survived, so Giants and Balloons raid this village.
This mission is accomplished!
First, the player in the video deploy 15 Barbarians in an entrance. After traps in the entrance are gone, he deploys 30 Barbarians to take out an Archer Tower.
Same as above, the player deploys 5 Barbarians to remove traps in an entrance. After that, he drops 21 Barbarians. They will attack an Archer Tower.
Since many Barbarians were defeated, The player adds 14 Barbarians in the lower part of the picture, and adds 4 Barbarians in the upper side of the picture in order to take out Archer Towers.
In the lower side of the picture, Barbarians failed to take out the Archer Tower. So, the player drop rest of Barbarians.
After Archer Towers are gone, the player deploys 2 Balloons. Canons and Mortars cannot attack them, so they can do what they want.
Balloons destroyed all the rest of buildings. This mission is accomplished!
[Level 17 - WatchTower] Hints & Tips