Minas Tirith: Attack on Orc

[Zor]

In this scenario, at the battle of Minas Tirith (movie version) a couple things have been altered.

The first of which is that outside of Minas Tirith there are several hundred solid 40 meter tall towers (6 meters at the base and 4 meters at the top) made of brick on a grid, spaced out about thirty meters from each other. This extends out about a kilometer and a half from the city itself.

The second is that the army of Gondor is replaced by an equal number of members of the Survey Corps from Attack on Titan each with 3D Maneuver Gear, at the same time an air compression facility has been set up inside the city. Every man who had a bow in Gondor's Army is replaced by someone who has a musket. Gandalf and Pippin are still present for all that's worth.

Can this force hold off the Armies of Mordor, or would it leave Minas Tirith more vulnerable?

Bonus Version ein: If the Survey Corps guys are too powerful, Aragon does not bring in the Ghosts at the end.
Bonus Version zwei: If the Survey Corps are too poor a choice, the Trebuchets are replaced with wall cannons
Bonus Version drei: If the Survey Corps are too poor a force of defenders even with the artillery, we add to their Ranks Eren Jaeger who can Titan shift.

Zor

[Ziggy Stardust]

Bonus Version ein: If the Survey Corps guys are too powerful, Aragon does not bring in the Ghosts at the end.

As portrayed in the movie, weren't the Ghosts essentially a one use deus-ex-machina that would have won the battle pretty much regardless of what else was going on? Certainly, the movie seemed to imply that they were practically unstoppable.

I don't have the slightest clue what Attacks on Titan is, so I can't really speak to this scenario at all other than that.

[Vendetta]

The guys with muskets are more useful.

Bear in mind that the Survey Corps has only 300 members at maximum, and 3D maneuver gear is designed for attacking targets 7-15m off the ground. If they tried to make any kind of impact on a formed unit of troops they'd just get entangled and die horribly (and dying horribly seems to be what they're best at anyway)

Eren might make a difference simply because of the speed with which titans regenerate and how unlikely it is that their weakness will be discovered. (If it were then it's not impossible he be brought down from the air by a nazgul.

(The army of ghosts in the movie was fucking stupid, in the book they don't even go to the Battle of the Pelennor, just clear out enemy ships docked at a river port which allows Aragorn to muster actual troops from southern Gondor, and it appears that their effect is the fear they cause rather than any actual physical attack).

[Iroscato]

I don't have the slightest clue what Attacks on Titan is, so I can't really speak to this scenario at all other than that.

It's an anime series, and a damned good one. This is coming from someone who never touched anime before I watched AoT, and I HUGELY enjoyed it. Watch it. Now.

[Kojiro]

In my head there are two versions. In the anime version where the 3DMG works as intended and the characters can anime trope their way to victory, no problems.

In the live action version... I'm sorry I just can't see it functioning in any remotely useful way.

[Vendetta]

Attack on Titan isn't the sort of anime where you get victory, at best you don't get eaten today.

[Stormin]

It has been mentioned in other discussions that squads using 3d gear have been trained for anti people work. Those ones would probably help a lot more in this situation.

Really though this does add what is scientifically referred to as a metric shit-ton of defensive towers with an almost unstoppable resupply/escape method. The enemy would have to knock every single one of these over or risk highly mobile defenders retaking defensive positions within their lines at will.