Why did the Germans not encircle and besiege Stalingrad?

Hitler split up his Eastern Front army... Bad decision.. He should have kept his army intact, took the oil fields of southern Russia and while having his army intact, he could have taken and kept Stalingrad... He tried to swallow a huge 5 course meal in one bite and inevitably choked to death.

Well, the problem with encircling Stalingrad is that; it is located on the far bank of the "River Volga". So, it's nearly impossible to encircle a city that is located on the far side of a river. But, the germans could have just surrounded the area outside of Stalingrad, and that is possibly the closest they will get to "encircling Stalingrad". Moreover, if Hitler wanted to capture the oilfields of Baku, it would be extremely difficult because Germany's supply lines would have been stretched too far out. But, let's just say they capture the oil fields. Well, bringing the oil back is another issue. It is back the Baku is more than 1,000 km from Stalingrad and MORE THAN 3700 KM FROM BERLIN! So, that means they will have to get past Partisan Movements, through Soviet counterattacks, through ariel raids, and through the harsh environment. I don't know about you guys, but if I was Adolph Hitler, I would have listened to my generals to not be obsessed over Stalingrad, and go for the main target the Caucasus. Also, if I could not capture the Caucasus, I would just bomb it. I know this will sound crazy too many of you. But, it is strategically correct. The Soviet got approximately 75% of their oil from the Baku. So, if there is no oil in Baku, then there is no way the Soviet can continue the war. I don't know about you guys. But, if the Soviets are low on oil, and oil from the Baku is vital for them. I would just snatch it away. It definitely will not be the best thing to do. But, as long as the Russians aren't getting any oil, I am okay with that

Hitler intended to fight in Stalingrad; it was not a mistake. At one point, the German 6th Army was tying down 60 Russian divisions, this allowed the rest of Army Group South to reach the oil fields almost unchallenged; however, the mountain terrain added weeks to the objective - weeks which the army group were supposed to have returned north to relieve 6th Army at Stalingrad.

Germany never attempted to cross the Volga at any point during the campaign. It was simply not part of the plan at any time, on any level. The Maykop oil fields was the main objective of Fall Blau, and Stalingrad was chosen as an optional objective only because it was a communications hub on the Volga that would make a convenient spot for the northern anchor to the Blau campaign.

Kleist later said after the war: The capture of Stalingrad was subsidiary to the main aim. It was only of importance as a convenient place, in the bottleneck between Don and the Volga, where we could block an attack on our flank by Russian forces coming from the east. At the start, Stalingrad was no more than a name on the map to us.

Hitler changed his mind a number of times about the objectives of Army group B (the norther arm of Blau). First Voronezh was optional. Then Voronezh became a target for an on the fly capture, which the Germans did manage. Then the 4th panzer army was diverted to support Army Group A. Then Hitler changed his mind again and redirected the 4th panzer army back to Army Group B to support the attack on Stalingrad (but not before giving 1/2 its forces to Army Group A)

Basically all this is to illustrate that the main goal was the oil fields in the south. And the German high command had very ambivalent/vague attitudes towards the goal of the Army Group B.

In truth, Army Group B had just one job. Protect the flank of Army group A.

Therefore, Voronezh was optional, and so was Stalingrad.

If I could attempt to summarize in a few bullets what seems to have occurred, (Death by Powerpoint!), I see it like this;

1. Nobody in their right mind (at least in modern warfare) attacks a major city directly, especially when it can be reinforced and resupplied from outside the city. A modern, mechanized army loses all advantages when it attempts to attack a huge pile of ruins that is defended by determined troops. The smart answer (as even the dumbest 2nd LT in the US Army knows, which is saying something) is to surround it and wait for the defenders to starve.

2. Crossing the river wasn't that big a deal. Both Armies did it on a regular basis in Russia. Large north south rivers are practically the only natural defenses in Russia west of the Urals. The engineers of both armies routinely crossed large rivers with pontoon bridges and that sort of thing.

3. A much more probable series of causes was as follows;

a. 6th Army was at the end of its logistical tether and had serious shortages of men and material that could not be made up in time. This did not allow it to attempt an operation of this size and scope.

b. If they were that short of men and materiel (and they were), then they damn sure didn't have the resources to successfully assault the city directly. If so, why did they try?

c. This gets closer to the heart of what I believe to be the real problems: Lack of a clear and focused strategic objective (Hitler), coupled with a baffling habit of changing objectives every week or 2 (as in 4th Panzer Army, again, Hitler) and dispersing their efforts instead of concentrating them.

d. A substitution of fuzzy emotional objectives (death to the city named after Stalin!) as opposed to clear, logical, pragmatic military objectives (again, Hitler).

e. Spineless Generals who would not stand up to Hitler and say no. But then, they all knew that would almost certainly get them fired, imprisoned, or shot (again, Hitler).

f. Hitler's unwillingness to listen to his own military professionals, who were actually usually pretty smart. If Hitler had listened to Guderian in 1941 and gone straight for Moscow right off the bat, screw everything else, they might well have won the war right then. But then, all that got Guderian was getting fired for a couple of years. Again, obviously, Hitler.

Spikew

The problem was that Stalingrad is actually a huge city. It lies for miles on the west bank of the Volga. The Volga in many places is a mile wide or more and if defenders are in the city it would be easy to supply them by barge from the river. Establishing a force on the east bank would have been pointless because there was nothing to attack there and there would have been no way to supply those troops.

One of the big problems is that the Germans had little heavy weaponry and ammunition. Normally, if defenders are holing up in a city like that, you can easily defeat them just by blasting them to smithereens with heavy guns, but the Germans simply did not have the ammunition supply necessary to do that, so they were running around fighting with rifles street to street which was useless. The Red Army won the battle because they improved their artillery supply to a decisive degree.

The answer is Hitler.

He was obsessed with the political damage the falling of a city named "Stalingrad" would have upon Stalin and the USSR, and wanted it more or less destroyed, so he explicitly ordered von Paulus not to encircle the city and wait for it to die(as the normal procedure would be), but to capture and raze it. Paulus was hesitant, but obedient, and he did as he was bid, which was a grave and fatal mistake, as we all know, and should have been apparent to anybody even back then.

Source: memories from a few books of Bevin Alexander, common knowledge, Wikipedia, tales