How to build up your Gaul tribe (defense)

Gaul are the defender tribe who are best in defensive..
because they can build a trap and they cranny can carry out about 2k resource when the cranny reach lvl 10, and they have a druid rider for defend infantry and phalanx for defend cavalier..

then how to be the best defender from Gaul tribe..
u can build more trap when ur trap build up to lvl 20 then u can build 1 more trap building there..

but at the first time it didn't use because they will have some troops may be about 10 - 20 if u trap them they will call for help to they friend for attacking ur village for set free they troops, just build up u cranny for avoiding more and more troops come to your village.. just safe your source at the first time.. then build up ur trap up to lvl 10 after that u may build some trap there but if u just have lvl 1 trap then u make a trap it will be useless.. you got it what i mean??

for this tribe just play simcity but u must build it as fast as u can
after u got a lot of trap there then u can train some phalanx or u can research for druid rider, when u got some prisoner there and have another attack wave then ur trap just have about bellow half of all ur trap just release your prisoner and take a new prisoner.. but if no attack wave coming u can just rebuild ur trap..

the trap effect : it's about crop. when some1 troops get prison by u the crops for that troops would be from the owner of the troops not you..
when all of they troops got prison at your village the attacker will out of crops for train a new troops and build up they village.