Once you spike vigilance high enough by spamming missions in the region Advent will begin to move legions there and more legions in a region means harder missions. Just keep mission generation in mind and flip your havens between intel and recruit as needed. After that it's all up to where you want to take the campaign.

After you have them put your haven back on recruit and finish contacting the next region where you then scan for missions there. One day before you have to launch the first mission flip your initial haven back to intel (rebels take a day to adjust) and then scan for the next set of missions in your original haven. By then your research should have finished so start to contact a new region, BUT DO NOT FINISH, let it sit at almost complete or as far as you get before your current infiltrations finish. Otherwise once the four days have passed or you've queued both missions put your haven on recruit and head over to contact the black market and purchase a scientist (sell everything from Gatecrasher, by the time you need the corpses you should have done a Troop Column - but hold on to the Sectoid if you want Psi). If you have not revealed the two initial missions (plus liberation 1 on lower difficulties than Legend lib1 does not spawn before the first supply drop on Legend) in the region I'd just restart as you won't get decent mission timers then.

Taking this into account, a good campaign opener is to put your initial haven on intel, start research on the tech that allows you to contact another region and scan for about four days with the Avenger increasing the haven's intel generation (note that there is a distinction between your intel resource and the intel required to unveil missions, the latter is simply the cumulative time of rebels in that haven spent on intel gathering). Every region can have at most two regular missions at the same time and then special ones like liberation missions or Advent activities like the precursor mission for a haven assault. The time you then have for infiltration is simply what's left before it reaches its expiration date. They already have an expiration date set and need to be revealed via the intel haven job. Mission Generation and Haven ManagementTalking about it, I feel like it's important to outline how mission generation works: Upon contacting a region or when currently present missions expire (either because they reach their expiration date or you went into tactical for them), new ones spawn but are initially hidden.

Long war 2 classes