Outpost 4

Outpost 4 (designation outpost satellite 4023 was one of a series of Earth Outpost Stations located along the Federation side of the Romulan Neutral Zone. The outpost was constructed on an asteroid that was composed of almost-pure iron, and was located a mile deep.  By the mid-2260s, the outpost was commander by Commander Hansen.

In late 2266, the outpost was attacked by an unknown attacker, that was later revealed to be the Romulan bird-of-prey, ChR. Although the station's deflectors and the rodinium plating of the hull, the Romulan's plasma torpedoes were easily able to penetrate them and take out the outpost's weapons. A second attack completely destroyed the outpost. (TOS episode & novelization: "Balance of Terror")