Rotate a low-ranking soldier into a new haven as an advisor for 2-3 weeks. If no Faceless are found, move them. This is tedious but critical. Losing 50% of your monthly supplies to a Faceless is a campaign-ender.
Combat in Long War is deadlier and emphasizes crowd control over pure damage. xcom 2 long war guide
In vanilla XCOM, you are the underdog who eventually becomes a super-soldier factory. In Long War 2, you are always outnumbered. You cannot fight the aliens head-on. You must pick fights you can win, retreat when outmatched, and use guerilla tactics (concealment, explosives, and evac) to survive. Rotate a low-ranking soldier into a new haven
A mission with 8 hours to infiltrate is a trap. Send a single Shinobi to scout and abort, or ignore it. Never suicide squads for bad timers. Losing 50% of your monthly supplies to a
"If the aliens shoot down your satellite, you lose contact. If you lose contact, you lose income. If you lose income, you lose the war. Prioritize your jets."