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In The Return of the King, Gandalf realizes that Aragorn's decision to use the Palantir to reveal himself to Sauron scared the Dark Lord so much that it actually forced his hand, leading him to send his troops to Minas Tirith much earlier than he had intended. Indeed, the actions of his army appear to be hasty and slapdash.

Sauron's servants have no trouble breaking through the Rammas Echor, but stall when they reach the gates of the city itself. Eventually, Grond breaks down the gate, but only one of Sauron's soldiers ever enters the city: The Witch King of Angmar; even he soon withdraws and returns to the fields. Of course, he only left because he was distracted by the arrival of the Rohirrim, and if not for this distraction, others would likely have followed him into Minas Tirith. But the city was well built and fairly well defended, and Sauron's army would have had to wheel Grond up a long, steep ramp, battering down 6 more gates along the way, to win the battle - by no means an easy undertaking.

Sieges aren't usually supposed to be over in a day, and when they are relatively brief, it is usually because the attackers are able to swiftly overpower the defenders. The events at Minas Tirith break all these rules. The siege was surprisingly brief, and the defenders quickly defeated a much larger force. This suggests that either Sauron is incompetent or the attack was never intended to be conducted this way, presumably because Sauron was compelled to throw himself into the fight before his preparations were complete.

Do we know whether Sauron's initial plans called for a longer, more typical siege, wherein the attacking army essentially surrounds their target and waits for the defending army to either starve or surrender?

  • @KillianDS - He didn't always expect the Rohirrim to get involved. Remember, Saruman was defeated only a few days earlier, and up until then, he and Grima had Theoden and the Rohirrim under their own command. I see no reason to believe that Saruman would have allowed the Rohirrim to go to Gondor's aid. – Wad Cheber May 25 '15 at 22:46
  • @KillianDS - I said he didn't ALWAYS expect the Rohirrim. Once Saruman was out of the picture, Sauron knew the Rohirrim were going to show up, and he deployed his troops accordingly; I believe this was a last minute decision, based on him finding out that Saruman no longer controlled Theoden. But until Saruman fell, Sauron had no reason to think that the Rohirrim would be a factor in the battle. – Wad Cheber May 25 '15 at 22:52
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    @randal'thor - Strategy? Maybe, maybe not. But TACTICS? He was an officer in WWI!!! He knew plenty about military tactics. I doubt he was entirely ignorant of strategy issues either. – Wad Cheber May 25 '15 at 22:55
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    @randal'thor - I don't know about that either. A helicopter gunner in Vietnam would probably know less about the style of combat in LotR than an officer in the communications service in WWI. Battle in LotR sounds more like battle in WWI than battle in Vietnam. The man fought on the Somme. He attacked the Schwaben Redoubt - that was a brutal assault, and it was a total disaster for the British. He knew the horrors of combat as well as anyone could. – Wad Cheber May 25 '15 at 23:00
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    The first day of the Somme Campaign was the deadliest day in British history. 20,000 men died, mostly within the first 4 hours. 40,000 more were wounded. They achieved none of their objectives. Tolkien was there. He stayed there almost until the end of the campaign. His unit was eventually wiped out almost to the last man. As he says in the introduction to LotR, by 1918, all but one of his friends were dead. – Wad Cheber May 25 '15 at 23:06
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I expect Sauron probably planned on it being a pretty quick siege, but you're forgetting something crucial. Aragorn used the palantir to cut off a large portion of Sauron's forces from the attack and to bring more Men in a surprise attack on the attackers.

Tor my part I heeded them not,’ said Gimli; ‘for we came then at last upon battle in earnest. There at Pelargir lay the main fleet of Umbar, fifty great ships and smaller vessels beyond count. Many of those that we pursued had reached the havens before us, and brought their fear with them; and some of the ships had put off, seeking to escape down the River or to reach the far shore; and many of the smaller craft were ablaze. But the Haradrim, being now driven to the brink, turned at bay, and they were fierce in despair; and they laughed when they looked on us, for they were a great army still.

(The Last Debate)

That night we rested while others laboured. For there were many captives set free, and many slaves released who had been folk of Gondor taken in raids; and soon also there was a great gathering of men out of Lebennin and the Ethir, and Angbor of Lamedon came up with all the horsemen that he could muster. Now that the fear of the Dead was removed they came to aid us and to look on the Heir of Isildur; for the rumour of that name had run like fire in the dark.

‘And that is near the end of our tale. For during that evening and night many ships were made ready and manned; and in the morning the fleet set forth.

(The Last Debate)

Aragorn, at least, believed Minas Tirith would fall without his assistance:

“Yet to the Harlond we must come tomorrow or fail utterly.”

(The Last Debate)

In addition, Sauron had many more forces he did not deploy in his assault, possibly - probably? - because of him speeding up his plans. Aragorn and Gandalf recognized that military victory against Sauron was impossible. Sauron was probably not terribly desperate that his assault succeed in the first place; he was just concerned about cutting off Aragorn's rise to power.

‘Hardly has our strength sufficed to beat off the first great assault. The next will be greater. This war then is without final hope, as Denethor perceived. Victory cannot be achieved by arms, whether you sit here to endure siege after siege, or march out to be overwhelmed beyond the River. You have only a choice of evils; and prudence would counsel you to strengthen such strong places as you have, and there await the onset; for so shall the time before your end be made a little longer.’

(The Last Debate)

‘I did so ere I rode from the Hornburg,’ answered Aragorn. ‘I deemed that the time was ripe, and that the Stone had come to me for just such a purpose [to show himself to Sauron]. It was then ten days since the Ring-bearer went east from Rauros, and the Eye of Sauron, I thought, should be drawn out from his own land. Too seldom has he been challenged since he returned to his Tower. Though if I had foreseen how swift would be his onset in answer, maybe I should not have dared to show myself. Bare time was given me to come to your aid.’

(The Last Debate)

Without Aragorn, the situation was dire. Even before the ships arrived, it looked like all was lost:

It was even as the day thus began to turn against Gondor and their hope wavered that a new cry went up in the City, it being then mid-morning, and a great wind blowing, and the rain flying north, and the sun shining. In that clear air watchmen on the walls saw afar a new sight of fear, and their last hope left them.

(The Battle of Pelennor Fields)

So instead of surrounding the enemy, Sauron's forces were themselves surrounded:

East rode the knights of Dol Amroth driving the enemy before them: troll-men and Variags and orcs that hated the sunlight. South strode Éomer and men fled before his face, and they were caught between the hammer and the anvil. For now men leaped from the ships to the quays of the Harlond and swept north like a storm.

(The Battle of Pelennor Fields)

Even so, it was not an easy battle:

Hard fighting and long labour they had still; for the Southrons were bold men and grim, and fierce in despair; and the Easterlings were strong and war-hardened and asked for no quarter. And so in this place and that, by burned homestead or barn, upon hillock or mound, under wall or on field, still they gathered and rallied and fought until the day wore away.

(The Battle of Pelennor Fields)

So the reason things didn't go quite Sauron's way was because he accelerated his plans, and Aragorn cut off part of his army and supplied unexpected reinforcements to Minas Tirith that would have otherwise been stuck defending other parts of Gondor. And Aragorn was only able to do this by cheating, by using a palantir and wresting it away from Sauron - something even Denethor was not able to do. He otherwise was pretty well set. Even after the battle, he was in an excellent position.

Sometimes no matter how well laid your plans are, they just don't work out. I don't think Sauron made any particularly grievous errors here.

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    +1, as always. But I'm not sure we can say Sauron didn't make any grievous errors, even if the specific events on the battlefield were not hopelessly mismanaged. In a larger sense, everything Sauron does stems from an unfathomably egregious error on his part- he never imagined that anyone would ever dream of destroying the Ring, let alone actually attempt to do so. All his actions are informed by this colossal misstep. And I personally believe that the outcome of the battle was partially the result of Sauron rushing into the fight before he was truly ready to do so. – Wad Cheber May 25 '15 at 23:51
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    @WadCheber: Well, also he made the colossal error of following Morgoth and rebelling against Eru. – Shamshiel May 26 '15 at 0:00
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    @WadCheber: I mean he used it to gain the intelligence of what Sauron was doing; he wouldn't have known he needed to do that in the first place without the visions from the palantir. – Shamshiel May 26 '15 at 0:27
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    Don't forget that there was an army of more than 6,000 orcs and Eastlerings blocking the road from Rohan into Gondor. Without Ghan-buri-Ghan's help, the Rohirrim would have been delayed, diminished or even defeated before they even reached Minas Tirith. A lot of events conspired against Sauron at the Pelennor Fields. – Ian Thompson May 26 '15 at 16:54
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    @WadCheber: Their hope was already 'wavering' by that point; the sight of the sails was the last nail in the coffin. – Shamshiel May 26 '15 at 18:14
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Great engines crawled across the field; and in the midst was a huge ram, great as a forest-tree a hundred feet in length, swinging on mighty chains. Long had it been forging in the dark smithies of Mordor, and [...]

(RotK, Chapter IV: The Siege of Gondor)

So a lot of time and effort was put into making siege weapons; clearly Sauron was expecting a siege of some sort. But given the arrogance he displays in his military strategy at other times, I suspect he was expecting Minas Tirith to fall swiftly before his might. I'm searching for canon backup for this...

  • +1 One of the things that confused me was the trenches full of fire. Trenches make sense in a siege, because they offer your troops cover from enemy fire (in this case, arrows and stones), but once you set them on fire, they are useless. The only effect the fire trenches had was to make it more difficult for Sauron's troops to maneuver the siege engines. – Wad Cheber May 25 '15 at 22:50
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    I wonder if those weren't intended to block off Rohan's approach? One of the Rohirrim says to Theoden: "There are great fires, lord ... The City is all set about with flame, and the field is full of foes." – Matt Gutting May 26 '15 at 14:25

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