One Earth Space Defense engineers were ready to test a prototype planetary-wide forcefield.

"How will we know it's effective?" asked Space Commander Erika Jones.

"We’ll know immediately when the Martian Republic launches another strike," answered the chief engineer.

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"I certainly hope so. They're developing an EMP bomb capable of crippling an entire continent."

"It'll work, ma'am."

"Fire when ready."

Sure enough, the Martians launched a barrage of interplanetary missiles exploding within their own terraformed atmosphere.

"Chief, did you miscalculate something? The forcefield isn't surrounding Earth."

"Correct, ma'am. Mars can now be designated a prison planet."

"Even better!" clapped Commander Jones.