When an attacker raids your outpost, and kills your whole defending team you lose influence. When losing influence, you receive an 8-hour shield. This shield will protect your outpost from all raids for the duration of the shield.

If your attacker loots the trade goods in your outpost, you lose but don't receive a shield since no influence points are lost.

If you attack another outpost while having a shield active, you lose the shield and other players can attack you again.