I just want to know if specialised defences works in the way I think it does. If I were to play it on a province with 5 strength it will go up to 10 strength, if I were to play it again in the same conflict will it go up to 20? Does the effect also stack with holdings that give province strength and other effects?
For example I have a boarderland fortifications on a pilgrimage. The province has 7 strength. I then play a nezumi infiltrator at home to increase the province to 8. If I play a specialised defences will the province strength increase to 16?