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The temporary advance called Insurgency grants a special ability that causes interior areas of your nation (areas that are deep within your nation’s territory rather than along a border) to have their Hit Points Per Square increased by 50%. This applies whether or not any of the nation’s players are online, and (if the players are offline) the hit point increase will stack with the increase caused by Total Defense.
Insurgency makes it especially difficult for invading nations to cut deep within your nation, for the purpose of “checkering” to decrease your nation’s Geographic Efficiency.
When attacking an enemy nation’s square that has Insurgency active, you will see a red shield on their combat stat icon in the battle display.