Fortification upgrade

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This article is accurate for the latest versions of EU3, Napoleon’s Ambition, In Nomine, Heir to the Throne and Divine Wind.

This is an event in NA, IN and HTTT but removed in DW, it is based on the Offensive/Defensive slider.


The following conditions must be met for the event to fire:

  • One's Offensive/Defensive slider is 1 or higher.
  • One has a level 1 fort in the province
  • One does not have a level 2 fort in the province.

Mean time to happen

The mean time to happen for this event is 5000 months (random event).

  • Offensive/Defensive slider set to 2 decreases MTTH by 5%.
  • Offensive/Defensive slider set to 3 decreases MTTH by 10%.
  • Offensive/Defensive slider set to 4 decreases MTTH by 15%.
  • Offensive/Defensive slider set to 5 or higher decreases MTTH by 20%.


Option 1: Quite right too

  • Add a level 2 fort.

See also