Ok, so the premise here is that Batman has picked up a Covenant signal from High Charity and numerous other Covenant ships. From the signal he deciphers, he learns that the Covenant are on their way to destroy Earth and all that jazz. So in order to prevent this from happening he has to infiltrate High Charity stealthily, fight and take down numerous Covenant, break into their command center and disable High Charity. All on his own, without any knowledge of Covenant technology. For argument sake, let's say he has a stealthy rocket ship that can get him there.
Can he do it?
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It would be done in less than 4 issues. My money is on him implanting a computer virus that sends the ships the opposite way they think they are going. While they think they are headed to Earth, they really go away from it.