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make a big row of despensers about 10-15 long(don't curve it like I did)
You need a lot of arrows and then put them in the despensers
Put 2 powered rails then 1 detector rail for the length of the defence system, next, put 1 powered rail at each end with a block behond it ...
At one end of the rails, next to the block, put a lever instead of a torch by the last powered rail (this is your on/off switch) Put ...
Another thing you can do is place it in a giant square and put castle walls on top of it. Then, make a circular track with the same ...
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