It doesn't work because you have as condition
"soldierWaa" countType array >= 4
as trigger condition, this means that if there are 4 AA soldiers or more EVERYWHERE on the map the trigger will fire. Besides the west activation is not considered because you have to put "this" in the condition field. Another error is that "thisList" contains the units that satisfy the trigger condition, so it doesn't even exist before the trigger is fired and thus can't be put in the condition field.
I made an error too because everything executed by an "end #" type trigger can't be seen because the mission ends immediately, so if you have a cinematic sequence, launch it from the first trigger.