Convoy Warfare Idea ID
The add_ideas ID for Convoy Warfare in Hearts of Iron IV is trade_interdiction_academy_spirit.
Convoy Warfare

naval_academy_spirit
Add this idea with the add_ideas command and the idea ID trade_interdiction_academy_spirit.
Effects
While active, Convoy Warfare applies the following modifiers in Hearts of Iron IV:
- Trait Seawolf Xp Gain+20%
- Trait Blockade Runner Xp Gain+20%
About this idea
Merchant convoys require special tactics and training.