EU5 Siege Lab

Sieges in EU5 are a lottery you can tilt. Pick a fort, a garrison, and your army, then watch 30-day phases roll the dice and get a full autopsy of why the fort fell or held. Built on the mechanics explained in our sieges guide and our combat guide.

Set up the siege

Choose the fort, its garrison, and the army you bring. Then tilt the dice to your advantage.

Fort Level2

Garrison (men)1000

Your Army (men)3000

Artillery Regiments1

Artillery Strength (%)100

Coastal fort Blockaded (navy in the sea tile)

Under siege

Month 1 · Phases 0 · Breaches 0/3 · Army 0 · Garrison 0

Enemy garrison

Siege progress

Siege autopsy

The numbers here model the EU5 siege system as described in our sieges guide: a d14 roll tilted by fort level, breaches, artillery, and blockade. It is a teaching tool, not the full simulation. Siege outcomes in-game are intentionally random.