It’s better to face three enemies at full health than five enemies at 25% health. Just make sure to position your Overwatch to take out as many targets as possible.
Enemies will start pouring into the battlefield, triggering Overwatch and giving you a free attack. With your last soldier, fire at one of the aliens and let the fireworks begin. Then, have all but one of the members of your squad activate Overwatch, attempting to target as much of the enemy field as possible. While you’re concealed, position your soldiers on high ground and around flanks, if possible. This gives you an opportunity to position your troops before the fight begins, or, if you have a stealth soldier in your squad, sneak up and take out enemies undetected. New to XCOM 2, you’ll begin many missions “concealed.” While you’re concealed, enemies will be unaware of your presence and will have a much more limited range of sight. Concealment and Overwatch make a deadly combo Holding Left Alt will bring up all of the targets your soldier will be able to shoot from the tile you’re highlighting, taking out all the guesswork and making it much easier to plan your turns precisely. War of the Chosen added a clutch feature that many players had already modded in, which is the ability to preview available targets when deciding where to move your units.