Just a curiosity: are the tabled (and demonstrated, I suppose) ranges of the various beam cannons (4 km for green beams except LRBGreen, between 6375-9750 for blue beams) are consistently accurate, and if so, why would a Karuna/Sanctus even attempt a head-on charge? The Yangtze case is perfectly understandable (not like they had any other options aside from trying to keep limping away, and they wanted to die in their feet, so to speak), but ones like the Nelson (and company) seem a bit odd.
I know the difficulties the Nelson and her cruiser screen were facing didn't leave a whole lot in the way of options, and they were just trying to buy as much time as possible for the evacuation of Artemis Station. But every UEF captain has to know (via Bei and 14th BG defectors) how much those beams out-range even their gauss cannons, and their general damage output. In other words, even if you're trying to buy for time with a suicide maneuver, why do it in the manner that is easiest and quickest for the enemy to dispatch you? The Nelson would lose almost half its health from the first pulse of the HBlue alone, and it would have to whither a BBlue and two MBlue's shortly after (by then, only his gauss cannons would be in range). The Chimera and Bellerophon corvettes flying alongside the Atreus would gut two Sanctus cruisers straight off, and you'd still have to get past the Hyperion cruisers and Diomedes corvette. In other words, they couldn't even hope to slow the Tev battlegroup down. They'd just put themselves out of the picture as quickly and easily as possible. Attacking from the direction where the Tevs are strongest and they aren't required to divert from heading right for Artemis at all is just...inefficient, even for a suicide mission.
And unless the Nelson could cover the distance from 9750m to 7200m in under 30 seconds, she wouldn't even be able to get a single gauss cannon shot off before getting gutted (or crippled) by the Atreus' HBlue alone.
If they had tried moving 'down' and attacking from below at a somewhat later time, would things have gone any better?
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As for the actual evacuation of Artemis Station--given the impossibility of holding the line for another twenty minutes and the very low chances of any significant reinforcements arriving, what exactly is the importance of 50 or 100 more people evacuating from the station before the Tevs took it over? Did they fear that Tev occupation would be a cruel fate, or were they trying to avoid the decision to enact scorched-earth protocol and remote-detonate Artemis Station before it fell into the hands of the Tevs (and before it finished evacuating)? Did the captain of the Nelson think it possible that major reinforcements would arrive in time (or at all)?
(Heh, maybe the Ranvir would show up and broadcast 'Eye of the Tiger' as its mass driver and gauss cannons roared with awesomeness.)