Massacred, surrendered. A difference that makes no difference is no difference.
And, as indicated, I was being facetious. Besides, we have no way of knowing what kind of force that was in Septimus III, other than broadly "military" in nature. In likelihood, they
were support troops.
Land war is insignificant in Star Trek, because orbital bombardment or the threat thereof is the means conquest or neutralization of enemy planets. Ground troops are for 1)the protection or securing of key infrastructure that is either protected from orbital attack or so valuable it will not be attacked, like a big subspace relay hub; and 2)to provide police functions during occupation. This is why there is no Federation Stararmy, only a Federation Starfleet. There is probably no real Cardassian Army in separate service.
As for whether they were left to die by the Founder for no reason, we don't know that either. Clearly, they had been significantly overexposed, but that doesn't mean that rescuing them was the correct military decision, or even possible. To use a WWII analogy again, did the Japanese make a mistake, by not evacuating the Philippines in the face of the American invasion? Not really, they didn't even have the option, because by that point in the war, they did not have the fleet resources to do it. It's just as likely that Damar's reaction was emotional as it is likely that it was logical. I agree that the Founder was callous, but 500,000 support personnel of an Order that no longer exists as a fighting force are arguably not worth the effort and risk.
And chances of success were low. Evacuating 500,000 soldiers would require huge starlift capacity. Hundreds if not thousands of transports. They'd be picked off by birds-of-prey as they shuttled up the evacuees. Or their transporter beams would be scrambled in midflight, reducing what came out on the other side to smoldering jelly. All this while pinning an escort fleet in orbit around a planet, at the mercy of enemy forces with faster-than-light operational flexibility.
I realize belatedly that that's a lot of words to exegize two or three damn throwaway lines.
