How did you manage to "Blow up the first outpost without having been detected"?

@FMSirDouglasHaig I only killed the one outside the compound, that you run in at the start and the one behind the wall on the right, to get access to the tank without being spotted. After that I placed 3 dynamite on the tank, 1 dynamite on the canon on the left and I destroy the cannon in the back with a single grenade. You just need to time the explosion of the grenade with blowing up the dynamite and you are done.