I was able to win by killing nexus, but the but is with the node closest to the enemy.

The stream of dumb reinforcements actually end up capturing that node and there's no way to take it back.

I ended up replaying it and then capturing the node in reverse starting closest to enemy and then working back towards my base.

i did it in one sitting, well tried to heheh

never received any reinforcements, had to do it the hard way

captured all the "victory locations" before killing halee, then destroyed the nexus, then cleared out the remaining defences around the fermium deposit, then captured fermium deposit, then.......... game continues, no mission complete. spent some time destroying every building and unit on the map, even tried to attack my ally (no luck there). saved and reloaded and all halee's turrets re-spawned and the mission dialog restarted (including granting me 4 more engineers) but halees nexus is still captured by me as are all her resource nodes, and recapturing the fermium deposit does nothing