Partisan script question

[El Condoro]

I am having trouble getting a custom partisan script to fire and think it might be because I don't understand the following variable. Can someone explain it to me, please? After surrender seems obvious but how does the game determine an invasion and what is 'full partisan'? Cheers

; PARTISAN FLAG REFERENCE VALUES
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; PARTISANS_ON_INVASION= 1
; PARTISANS_AFTER_SURRENDER= 2
; FULL_PARTISANS= 3
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

[BillRunacre]

Hi

Partisans on invasion means the script only fires if the country hasn't surrendered.

Full partisans means they can appear both before and after surrender.