Heart of the Swarm Campaign- Korhal: Planetfall (Part 2)

Just North of the second bile launcher is a Terran encampment with mineral and vespene resources on a plateau- if you need the increased income rate, you can move in and take it out while you're waiting for the third bile launcher to drop due North of your primary hive.  This one comes with a pair of ultralisks that you should take the opportunity to meld into your main attack force.

A small outpost with a bunker waits to the West of the fourth bile launcher's target location, a convenient spot for you to head to as the fifth bile launcher lands North of it very quickly.  This fifth location is in the middle of another resource-laden Terran base that you should quickly move to wipe out.  This base is protected by siege tanks as well as static fortifications and can do remarkable damage to your assault troops.  Additionally, if you take too long to destroy it, you will quickly be overwhelmed by Arcturus' force of assault walkers and medevac-transported marines that he sends after you with three minutes to the bile launcher's landing.

As a bile launcher location, this base is also very strategically useful- it provides a good staging ground for attacking the two Northern gate locations, it blocks off the Terran forces in that area from your base as a sort of a chokepoint, and you were going to defend it anyways because a bile launcher lands there.  Moving in some drones and starting a new hatchery/mining operation here is extremely useful, though not vital, to your further operations in this mission.  This bile launcher comes with a quartet of mutalisks- not the best addition, but far better than nothing, particularly as the location has come under attack by a pair of thors shortly before the launcher lands.  Using the raised terrain of the base and a combination of two to three total swarm hosts and whatever your hydralisks turn into (impalers are particularly useful here) it should be possible to prevent most of the damage the thors could have dealt.