![Smile :)](./images/smilies/icon_e_smile.gif)
At least he was trying to solve the same problem and failed.
To the point.
I'm playing hard mode. And I realized that my iron will run out soon.
And nearest iron field is under huge biters base.
I just researched logistics and weapon 3 and my resources are quite low.
So I decided to try tower creeping.
How I normally do this?
1. Place medium pole close enough to the next spawner.
2. Put a walls around coverage area of the pole.
3. Put turrets inside.
4. If low on turrets, deconstruct earliest of bunkers.
5. goto 1.
What went wrong this time? At some point I wasn't able to complete 1.
Constant stream of biters was around forward bunker.
At some point, after many failed attempts, I had to hide inside of the bunker.
And I suddenly realized, that I can build from the inside, instead of outside!
1. Expand wall toward spawner by 3 tiles.
2. Place pole inside new area.
3. Put turrets near pole.
4. Repair and remove inner wall.
5. Remove some turrets from back if need.
6. Shorten back wall if need.
7. goto 1.
100% safe and easy! Probably 2 and 3 can be skipped every other cycle.
Why I haven't thought about this before?
However, I made two mistakes this time. I moved too deep into the nest, and got attacked from 3 sides.
And I forgot that my mostly solar energy network can't keep up so much shooting at night
![Smile :)](./images/smilies/icon_e_smile.gif)
It was quite interesting to observe biters after I retreated.
First of all they destroyed turrets that I failed to dismantle while retreating.
Then huge crowd was just standing there for a few minutes.
And then they started demolition of remaining walls. But in a very strange manner.
It looked like they were assigning a few wall blocks to be 'primary targets' and
almost whole swarm was attacking them (or at least trying to attack). After destruction
of these walls they were roaming for a few seconds before repeating.
Here is screenshot made in the process:
![Image](https://forums.factorio.com/images/ext/afe68dc0fa447506da8e0a4c0d3e3f44.png)
p.s. car kiting was impossible. I couldn't even move close enough to fire.
p.p.s. Now I look at patch of iron ore on my own screenshot and feel even more stupid
![Smile :)](./images/smilies/icon_e_smile.gif)