The Big Gun was the primary defense system of planet Stroggos. It was an enormous cannon capable of detecting and destroying any approaching spacecraft over a few meters in length. The Mark 9A Drop Pod used in Operation Alien Overlord was designed specifically to circumvent this defense, depositing troops on the ground to disable the Big Gun defense, allowing larger warships to pass through.

The Big Gun was eventually destroyed by space marine Bitterman, one of the few survivors of the initial landing. This allowed the Stroggos Campaign to proceed to its next phase.

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