In my last game (BoS, Survival), my walls stopped the entry of the assaulting forces about 90% of the time, for example to the best of my memory:
1. Sunshine - robots from the northwest, mutants from the northeast and gunner from the southeast
2. Red Rocket - mutants from the west and east, and gunners and ghouls along the road from the southeast,
3. Starlight - synths from the southwest and raiders from northwest
4. County Crossing - raiders from the armory, ghouls from the west and synths from the armory
5. Oberland - gunners from the northwest
Below are several images regarding the walls (note: at Starlight the synths were shooting at me on top of the screen)
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However, it is good to save before the assault, in case the assault does spawn inside the walls.
My biggest problem with assaults is - my settlers charge out to meet the enemy, see image - just couldn't stay in the BoS defensive walls, had to run to the armory, but the settler "died with his boots on"
, see image:
View attachment 13426
Also, I use the Better Settlers mod (mortal and stimpacks). (Note: if anyone knows a mod that changes settler behavior during an assault, maybe similar to FO New Vegas companions, I would appreciate it).
The build limit can be changed at each individual workbench - Manage/Configure Build Limit.
PS: at County Crossing here are four spawn points outside the walls, see images:
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