The Forgotten will set up outposts in any territory near tunnel exits. Nearby human bases with an army of a similar level to the tunnel exit will increase the chance that the Forgotten will react. Outposts are better defended than camps, but yield even more resources.
Outposts are ideal to attack while farming, and activating Tunnel Exits will allow you and your alliance to benefit from quick growth due to the increase resource yields. Again they are better defended but if your army is set correctly and the tunnel is active and spawning outposts, you can Scout for Outpost that can be a 1-shot kill. The yielded resources are a waste of CP and RT if it takes more than 2-shots. Below is a little more information on how Tunnel Exits work and how to activate them.
- Which armies can activate a tunnel?
Armies with Levels up to -6 or +6 can activate tunnels.
Example: a Lvl 26 tunnel can be activated by army Lvl 20 or up to 26 , higher or lower than that they do not spawn.
- What outposts do tunnels spawn?
Outposts spawned are level -2 to +2 of the tunnel exit.
Maximum levels of outposts are achieved by stronger armies.
- Do tunnels get deactivated by weaker armies?
NO.
Lower armies are just not taken into consideration by the tunnel to the outpost spawning factor.
- If there are more strong armies around the tunnel exit will it spawn more outposts?
YES.
More bases equal more outposts.
- How long before my base activates a tunnel?
It is random and can take up to 24 hours!
- In what distance shall the bases be put to activate it?
The chances are that this is also a kind of random factor because information is random and changing. I personally used to get at 4 space distance only, people on forums claim 6 (tested and works), a moderator claims a couple of days ago that it is up to 7 or 8. I believe it is random for each tunnel but a safe distance of 4 spaces activates the tunnel for sure.
- Is there a maximum number of bases that can surruound a tunnel?
Yes, it is 8 bases.
- How far do outposts spawn from the Tunnel Exits?
Official representative wrote and I quote:
'' The actual outposts can appear as much as 8 fields from the tunnel, well outside your control area for a single base. ''