Love that mission, though it fails to work with basic concept of locking down every road around the area of operations - the "firestarter" vans just keep spawning endlessly. Though, probably, the most police-action filled mission (not counting the third - it's just not challenging)
Oh I remember that time I just started playing EM4, was still a big noob, and when I almost finished up with this mission (was trying to do it for a long time) LA Mod decided to crash on me.
I take advantage of some of my personal LA mod's features. I can arrest the two snipers at the cabin by sending a heli with 2 SWAT officers on board. I arrest them using my modified armed arrest script so they drop the rifle and surrender. Then I send an UNMK car with another 2 SWAT officers to secure the cabin in case some of the terrorists manage to get in the permiter there.
Elsewhere, I position police cruisers with 2 officers at various strategic locations where I know the terror vans spawn from. They are:
- Northwest forest trail
- Western Forest trail
- Southern forest trail
- Coastal road southern portion at map edge
- Town at east side
On locations 1, 2, 3, and 5, vans with armed men will spawn.
On locations 1, 3, 4 and 5, vans that explode will spawn.
The trick here, is to NOT secure the witness until all of the armed terror vans spawn.
Usually, locations 2, 3 and 5 will spawn within the first minute (usually at 1:10). The patrol cars I placed here will "block" them preventing them from moving forward. I then use my modified Chase command on the vans to "stop" them. One or three riflemen will exit. Its random. I use my arrest command to disarm them and arrest them. I immediately send a tow truck to tow away each van to prevent them from detonating anyway.
After about 4 minutes or so, the bomb vans show up from the above locations. Its pretty easy to repel them. Simply have an officer redirect them, but do not position them in the direct path or they WILL be run over. To be safe, I preferably rely on the redirection lights. Thats why it is essential to have vehicles positioned there. Once the bomb vans are redirected, they will go "out" of the map and harmlessly explode without damaging anything.
All the while, I have a pair of LASD vans roving around the map, collecting the arrested terrorists.
Here's the issue though. The creators of the game actually did this mission script right. It isnt the same deployment of vans all the time. It usually is just like the above, but there are oftentimes where bomb vans spawn first ahead of the personell vans. In this case, having the strategically placed police cars redirect them will save you the trouble of fighting fires.
Fires do ocassionally break out due to the script glitching out and instantly detonating the vans. In which case, I leave an engine at the NE spawn point on stanby just in case.
Getting the dead agent's bodies out is the last thing to do. Once the first and second wave of vans runs out from all 5 specified locations, there will no longer be any vans spawned by the game. At this point, I send a single coroner's van, and use the officers at the cabin to declare the agents as dead and give them body bags.
The witness by now should be by himself safe on the map with this:
much protection.
But the objective is to get him out of the map, so I would take the witness, put him in the helicopter, and then send the helicopter home. Mission complete.
Note that this solution only applies to my personal LA mod because I modified some scripts to allow the player to disarm all suspects and arrest them peacefully.