Welp.
Contrary to what the first picture might imply I actually would have won even if the game continued past that point. My military was vastly overprepared for the zombies, but I forgot one thing: a reserve. Oddly enough it was the main gate which fell. It had a lot of troops but was just a long double wall and a single shock tower. I had been going around to my many gates fixing up the ones that weren't to snuff, I guess it was inevitable that I would miss an important one. A good 8 thanatos and 50 snipers were defending entrances that were never attacked. Next game I'm definitely going distribute my forces throughout the town for the final defense, and then send them to the walls only after I know where the zombies are going.
Unfortunately for New London, the front gate was also coincidentally the furthest from any other garrisons AND the closest to the main town. I desperately threw all my resources into a last wall between the zombies and the command center. That held off the zombies, but there was no one defending the wall. Most of the other defenses had held or were holding, so I desperately pulled ever increasing numbers of soldiers back into the defense. They approached the horde from all sides, but unfortunately due to that specific breach point the zombies held the densely populated oldest districts and we were the ones attacking into them. The zombies pushed so far in that it was just a single wall between us and defeat; the only thing that saved the command center was an 8 man thanatos team that managed to get behind it and fire mortar shells over it. The explosions physically pushed back the horde long enough that the rest of the military could arrive to clean up. All of the old town was demolished or destroyed. Not a single house was left intact. The town was designed so that the military and work areas served as a buffer between the main town the outside, except for that one gate. Man am I kicking myself.
In addition to the main town, there were two "satellite" towns loosely connected to the main one. The tent shanty town to the northwest was overwhelmed when one of the largest hordes noticed it on the way to the main town; its southern gate was smashed although its defenders killed many zombies. The northern gate held off the zombies from the outside and then scant hours later were forced to turn their guns on the shantytown's infected residents, they lost their shock tower and two of their sniper towers but four snipers won the battle with their tower intact, being the only survivors from the shantytown.
The other satellite town, a sort of cottage suburb to the north, was left mostly unscathed. Some zombies were bashing their way through a few cottages on the edge when the game ended, but snipers were hot on their trail. I wanted to see how that ended but considering I got the victory screen I'll just assume we took care of it. Pretty sure we would have.
The only other areas that survived were a small cluster of cottages shielded behind the southern gate (which itself almost fell), the military employees in most of our barracks and shock towers, and the workers in the heavy industrial district to the north of town. That's... the extent of who survived in New London. Out of the prior population of 2000, I'd estimate 500 survivors. The military fared much better; out of ~250 soldiers, I'd estimate "only" 75 were killed.
So, yeah. Had my first town survive! For some definitions of "survive", at least.