Questions on script and "sacking"

[Myrddraal]

thats because when you reload a game, the 4TPY script actually runs the entire script up to the point where the turn number is correct.

To avoid this problem put

if I_TurnNumber = 0
Enter script here
end_if

That way it will only happen on that turn and not afterwards

[LestaT]

So, is that means I have to delete all end_if after the spawn army script except spawn_armyD ?

Anyway another advice I recieve is to delete part in bold and change
the and I_TurnNumber > 21 to
I_TurnNumber = 21
as below. Is there any differences ? I tested this one first, and the army didn't spawn again (already spawn on the exact date) when I reload the game. However I didn't test the game before it spawn to see if the script works.

Thanks for the advice Myrddraal

while I_TurnNumber < 1840
select_ui_element advisor_dismiss_button
simulate_mouse_click lclick_down
simulate_mouse_click lclick_up

suspend_unscripted_advice true

;;;;;;;; spawn_army ;;;;;;
declare_counter spawn_army

if I_TurnNumber = 0
set_counter spawn_armyA 0
set_counter spawn_armyB 0
set_counter spawn_armyC 0
set_counter spawn_armyD 0
end_if

;;;;;;;; spawn_army ;;;;;;
monitor_event FactionTurnStart FactionType greek_cities
and I_TurnNumber > 21

[LorDBulA]

I_TurnNumber = 21 is what you want.
This peace of script:

monitor_event FactionTurnStart FactionType greek_cities
and I_TurnNumber = TURN_NUMBER

will ensure that inside of this monitor will be executed only on turn equal to TURN_NUMBER and only at the begining of greek turns.
It will be executed only once.