Strength

Strength is a stat that appears on Provinces. It can be increased by Strongholds and Holdings.

Province Mechanics
If an attacker wins a Conflict by an amount equal to or greater than the Strength of the Province they are attacking, the province is broken.

Stronghold and Holding Mechanics
The Strength value on a Stronghold or Holding modifies the Strength of the Province they are in, increasing the amount an attacker needs to win by to break that Province.