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|                 |         1.51)  Sydney City Wall         |                 |
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Mission Briefing
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"While the nuclear warheads are secured, the Brotherhood still lacks launch
 codes and delivery systems.  GDI has what we need in the Sydney Blue Zone,
 currently under heavy Alien attack.  With GDI's forces under duress, Kilian
 has reached out to the local GDI commander and offered to 'help' in Sydney.
 GDI accepted.  We have committed to the elimination of three key Alien
 structures, the Portal, Gravity Stabilizer and Gateway, giving GDI the
 leverage they need to turn the tide of battle.  Unofficially, we need to
 ensure that the Gravity Stabilizer does not go down too fast;  the
 Brotherhood's primary target is a GDI facility in Sydney, which, when
 captured, should provide the location of the codes and missiles.  That
 building is within Sydney's city walls, and nothing penetrates those faster
 than an alien Devastator warship."

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Intelligence Database
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Nod Field Intelligence

 - Cease Fire Order
 - Exceprt from Signal Intelligence Briefing

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Primary Objectives
==================

1)  Eliminate Three Alien Targets for GDI.

"GDI needs us to disable or destroy these three targets in the main Alien base:
 the Signal Transmitter, Warp Sphere and the Portal."

2)  Capture the GDI Lab.

"Inside the GDI Lab you'll find the release codes for our nuclear warheads and
 a map of where GDI is storing the warhead delivery systems."

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Bonus Objectives
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1)  Capture two Tiberium Spikes.

"The Brotherhood is running short on funds.  Capture both of these Tiberium
 Spikes and rectify the situation."

2)  Destroy the Ion Control Center.

"We have received an additional objective from an unidentified source.  You are
 ordered to destroy GDI's Ion Cannon Control Center."

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Walkthrough
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You'll be given a base to start with {Cease Fire Order}, but you'll want to
build a Tiberium Chemical Plant and an air tower right away.  The Scrin base to
the west is fairly well fortified, and they build an insane amount of units
throughout the mission, but there's a fairly easy way to destroy all three key
structures within a few seconds of each other, assuming you're willing to do a
little preparatory work first.

Place a pair of Obelisks on the west side of your base to defend yourself, and
keep some stealth tanks nearby to deal with aircraft.  Meanwhile, train five
Saboteurs and use Call for Transport to send them all the way to the
north-east corner of the map where the GDI Lab is (make sure you hug the right
side of the map on the way up to avoid Scrin attacks).  Dump three of the
Saboteurs up here, then send the other two transports west along the top of the
map to the two Tiberium Spikes.  Capture them one at a time, and make sure you
don't waste any time with the lower one (or the nearby Scrin units will kill
your Saboteur before he can make it to the Spike).

Capture the GDI Lab and the Space Command Uplink with two of the Saboteurs in
the north-east corner, but don't capture the Ion Cannon Control Center yet.
Instead, sit back and concentrate on building two more air towers and filling
all three of your towers with Vertigo bombers.  Continue defending your base
until the Scrin break through a section of the Sydney wall {Exceprt from Signal
Intelligence Briefing}, then use your last Saboteur to capture the Ion Cannon
Control Center (if you capture it before the wall is breached, GDI will
somehow have control of it again, and the timer will be reset).

With the Ion Cannon under your control, all you need to do is sit back and wait
for the timer to count down.  When it does, use it to pulverise the Signal
Transmitter in the lower-left corner of the Scrin base, then sell the Ion
Cannon Control Center to accomplish the second bonus objective.  Immediately
send your Vertigo group north, then due west towards the Warp Sphere in the
upper part of the Scrin base (make sure you reveal the shroud above the Portal
in the eastern part of the Scrin base on the way there).  Since you can see the
Portal now, you can use the Shockwave Artillery and the Tiberium Vapor Bomb
abilities on it from your side bar, which will destroy it.

When timed well, all three Scrin structures will be destroyed before their huge
retalliation force can even get to your base.