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|                 |           1.74)  Threshold 19           |                 |
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Mission Briefing
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"Foreman, you must protect the tower at Threshold 19 until its construction is
 complete.  Everything hangs in the balance:  The success of your overall
 mission and the fate of the Race depends on Threshold 19 tower activation and
 phasing.  You now have access to all our offensive and defensive capabilities.
 Take command of the base that is established there and keep the hostile
 indigenous population from destroying the tower at all costs."

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Intelligence Database
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Warp Link

 - Threshold Tower Construction
 - Threshold Assemblies Under Attack

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Primary Objectives
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1)  Defend the Tower.

"Foreman, GDI has a strong force to the north.  They appear to be intent on
 destroying the Tower.  Overwhelming forces on their part suggest difficulty
 in removing them from the region, but they must be stopped at all costs from
 destroying the Tower."

2)  Construct a Signal Transmitter and summon the Mothership.

"The Tower is the complete and impervious to GDI's attacks.  Focus on
 constructing a Signal Transmitter so the Mothership may be summoned to your
 location for evacuation off the planet.  Hold out against any hostile activity
 from GDI."

3)  Guide and protect the Mothership to the Tower.

"Foreman, guide the Mothership to the Tower for evacuation and continue to
 hold off GDI's attacks."

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Bonus Objectives
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1)  Destroy the GDI base.

"Destroy GDI's base in the northeast of this region."

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Walkthrough
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This mission can be hectic, but there're a few tricks that can make it a lot
easier.  {Threshold Assemblies Under Attack}  First of all, destroy the bridge
directly north of your base as soon as possible.  Next, focus on placing at
least two storm towers in the upper left portion of your base, then crank out
Devastators (a second Gravity Stabilizer is probably a good idea).  The Ion
Storms generated by the storm towers will heal the Devastators, which makes a
powerful defense.

Meanwhile, GDI will be sending hoards of stuff at the tower in the upper-left
part of the map.  If you've been building Devastators fast enough, you should
be able to spare a cluster of four or five of them fairly early in the mission.
Send them due west, then approach the tower from the south to avoid the GDI
units.  Park them next to the Planetary Assault Carrier so you can make use of
the Ion Storm, then if possible, destroy the bridge near the tower to slow down
GDI attacks.

The timer to the tower's completion isn't very long, so you shouldn't have too
much trouble defending the tower with those Devastators and the Carrier.  If
you do have problems, though, make use of your warp sphere in your base to
build some Seekers, which you can send through the portal in your base to
instantly send them to the tower.  You can also send a cluster of Devastators
to intercept the GDI units in the middle of the map before they can go around
and hit the tower's defenses from underneath.

When the timer reaches zero {Threshold Tower Construction}, you be told to
construct a Signal Transmitter and summon a Mothership.  If your Devastators
and Carrier are still alive by the tower, safely send them to the south and
then over to your base to aid in its defense.  Meanwhile, build the Signal
Transmitter and a Rift Generator.  When the Signal Transmitter is built, use
it to summon a Mothership and receive your final objective.

If you want to accomplish the bonus objective, you'll need to wipe out the GDI
base before you send the Mothership to the tower.  You'll be able to build
Planetary Assault Carriers now, so go ahead and build a ton of them.  They're
incredibly powerful, and their Ion Storm ability is a huge help.  When you've
got a bunch of them, gather all of your Devastators and Carriers together and
demolish the GDI base (make sure to get some use out of your Rift Generator
when it's charged, too).

Don't send your Mothership towards the tower without clearing the path with
your Devastators and Carriers first - GDI will have outposts with anti-aircraft
guns throughout the map, which can do some serious damage to the Mothership.
When the GDI base is destroyed, send your fleet to the marker by the tower to
end the mission.