If they will not meet us on the open sea (a Trent TL)

I know that wrought iron wasn't used against hard targets, these shells were either Hartgusseisen, which I think means white cast iron, or steel. But it seems the white cast iron was the standard shell.

I don't know how accurate Total Materia is but they write about white cast iron: "While low-alloyed pearlitic white iron castings develop hardness in the range 350 to 550 HB, the high-alloyed white irons range from 450 to 800 HB."

Don't know where the shells would fall on that scale.
 

Saphroneth

Banned
Cast iron of the period is generally very brittle, whereas steel in this case is valued because it's both ductile and hard (that is, it transfers all the energy to the target - a cast iron ball shatters and most of the energy goes to waste).
It's possible that Hartgusseisen is what we'd view as steel for the purposes of penetration, but it looks like it's rather too brittle and that they'd need to get some specialist rounds.
Be a dramatic moment, though, if they fired their special AP rounds and they broke up on impact.


Do you know if those shells were filled? From memory in 1864 the concept of the armour piercing shell was quite new, though Palliser had been going for two years.
 

Saphroneth

Banned
They're either filled with powder (without a fuse because the impact would ignite it) or solid iron as far as I can tell.
That's quite a difference! The former would be much lighter and hence carry a lot less energy for the MV, the latter would be more likely to penetrate though of course less destructive.

It looks (from translating the Danish Wiki article on Rolf Krake) that the ironclad was indeed vulnerable to some Prussian artillery at this time at close range - I think the interpretation I'll use is that at long range only a solid steel "bolt" can penetrate, and that without the energy to do further damage, but that within close range either bolts or filled shells (i.e. Palliser) can do damage.
 
On the German Wiki they list a fight with 150 hits but no penetrations at roughly 500 metres. In another a 24-pounder grenade penetrated the deck.
Also Rolf Krake apparently had no exposive grenades?
 

Saphroneth

Banned
On the German Wiki they list a fight with 150 hits but no penetrations at roughly 500 metres.
That's what I'd consider long range, or medium at least - "battering" is within 200 metres, and for this time period even that is not very short. Remember the ram was considered at least a usable weapon!


Also Rolf Krake apparently had no exposive grenades?
I can't imagine they're unable to find at least some shells of the right calibre - this is about two decades after the introduction of shells into sea combat in a big way, and TTL they're planning on using her for shelling of land targets.
 
I can't imagine they're unable to find at least some shells of the right calibre - this is about two decades after the introduction of shells into sea combat in a big way, and TTL they're planning on using her for shelling of land targets.
Well they also did that in OTL, at least two times at Dybbol (28th of March and 18th of April) and back in February they tried to hinder the building of a pontoon bridge.
 

Saphroneth

Banned
Well they also did that in OTL, at least two times at Dybbol (28th of March and 18th of April) and back in February they tried to hinder the building of a pontoon bridge.
I'm aware, but I should stress planning. (OTL there were Austrians to worry about - TTL the Prussian navy is essentially a joke and is penned in port.) Shot has no advantage compared to shell in this situation.
 
They had to have been planning on fighting the Austrians, though, at least until they didn't send troops. And in OTL they did not manage or want to scratch up the shells even when the Austrians were still far away and they could have used them. It's a rather narrow window is all I'm saying.
 

Saphroneth

Banned
Quick update - I used my handy-dandy Fairbarn calculator sheet to work out the penetration of the Prussian 24 pounder (which by the way is a stupid name, it fires projectiles of more like 70 lbs - who came up with that?)

Anyway. fps versus penetration of unbacked iron:

Wrought iron rounds

V (fps) T (penetration, in)
800 2.23
900 2.51
1000 2.78
1100 3.06
1200 3.34
1300 3.62
1400 3.90
1500 4.18
1600 4.46
1700 4.73
1800 5.01
1900 5.29



Steel rounds

V (fps) T (penetration, in)
800 3.67
900 4.13
1000 4.58
1100 5.04
1200 5.50
1300 5.96
1400 6.42
1500 6.88
1600 7.33
1700 7.79
1800 8.25
1900 8.71



Since I assume Rolf Krake's side is about a 5-5.5" unbacked wrought iron equivalent, it's on the margin of being able to penetrate at battering range. This seems much more in line with what actually happened, so I must have been making a mistake somewhere.
 
13-22 March 1864

Saphroneth

Banned
13 March

Two Prussian 24-pounders engage Rolf Krake from close range with Hartgussteisen rounds, the standard round used to penetrate solid positions for the Krupp guns. These promptly shatter on impact with the armoured belt, leaving small dents.

One of the 24 pounders is pulled out of the advance position successfully, though the other loses part of the carriage to Rolf Krake's fire and is left where it is. Urgent requests are made for steel (or ideally palliser) bolts instead.


14 March

General McClellan determines that he will inspect the armouries of the various State militias, and the militias themselves, in order to determine their quality. His friend Grant (the two men are working on a book to counteract Butler's allegations, their third piece together) raises the concern that this will take many weeks of travelling around the country; McClellan agrees. (In fact this is in no small part his reason for the inspection tour, as he wishes to put his case to plenty of people both as a concerned General and as a contender for the Democratic presidential nomination.)


16 March

Assault preparations are being finalized for the attack on Dybbol. This is still well before the assault can be executed - the forts are still in reasonable state and further damage needs to be done.
Among the notable elements of the plan is that the entire corps contingent of military bands will be a few hundred yards from the Danish positions, playing loud martial music from under cover!


17 March
Wilkes sends his first draft to Butler, who approves greatly - not being a naval man, he does not really have enough experience to fact-check it.
The document suggests the USN should have launched immediate first-strike naval attacks on Halifax, Rum Key and Bermuda, destroying the logistical base of the Royal Navy in American waters before they could react; that various navy men (from Farragut to McKean and Bailey) were incompetent; that the monitor program should have been vastly accelerated; and plenty of other things.
How a navy of about six frigates should have been expected to stand off one with ten times that many ships of the line is not really explored in any great detail, however.


19 March

The Skjold lurks menacingly outside Hamburg for several hours, attempting to provoke fear and a clamour for peace in the city. This is largely not successful in provoking such fear.


20 March

News arrives in Europe of the latest developments of the "Maximist" view on race.
Maxim preaches that the allele system of traits demonstrates racial superiority for the white race (which he calls 'manifestly dominant'), and that a single drop of 'negro blood' can cause a weakening in a strain of whites by introducing "recessive traits", while a single drop of white blood can strengthen a negro bloodline with "dominant traits".
When the news of this odd interpretation of inheritance reaches Charles Darwin, he just looks baffled.


21 March

After a night sleeping on the subject, Darwin writes a considered letter to Mendel about the possible variations on the theme of "dominant" versus "recessive" traits. He commends to Mendel the example of the common cow, and how a white bull mating with a red heifer produces spotted (red-white) offspring - but the mating of these offspring may produce red, white or spotted children in turn.
He also uses the term "pangenes" to refer to the traits, a reference to the concept of pangenesis.




22 March

After much delay, sixty steel bolts are delivered to the Prussian army for use against armoured ships.

Three of them are tested against a target made up to be like the Rolf Krake's side, using 4.5" armour (surplus from Britain) and 8" of backing. The results show that a penetration is possible, but only at quite close range (roughly 200 yards) and using the full charge.
Recommendation is made that the full charge should be used when engaging ironclads, and that in emergencies a "Grosse" charge may be authorized (with 2-4lb extra powder) even though this places the gun at severe risk.
 

Saphroneth

Banned
It's strange how some of the most odd elements of an ATL are actually OTL. (Incidentally, Google Translate is very good by now, I can use it to browse non-English wikis.)
 
24 March - 1 April 1864

Saphroneth

Banned
24 March

General McClellan inspects the militia armouries of the State of Illinois, noting that the head of the War Department (a Lincoln selection, of course) has not been getting weapons to the armouries as fast as he could and that it seems as though the old pre-war policy of dumping the worst weapons on the state miltia has been kept up.
While there, he also discusses a few things with local politicians over dinner and makes a speech. The speech is relatively unpracticed, but it contains a number of key points.
1) An army and a navy sufficient for defence is adequate for a nation, formed on a well-organized militia with a substantial regular corps.
2) The Republicans screwed us over totally with the war with England, and managed to get the Republic into two concurrent wars and lose them both.
3) I would have won the war in 1862 if Lincoln hadn't gotten us into a mess with Britain, and if my Peninsular Campaign had had full support.
4) A revenge war with Britain, or a war with the South, would be costly and unnecessary.
5) I would rather have no slavery than slavery, but rather have legal slavery than illegal abolition.
6) If slavery is an economic mistake, it will die out; if it is an economic boon, it will thrive; if no law is placed to impede or promote it, slavery will do as well as it should in the Republic.

The truth of some of these is worth questioning, but the whole is a persuasive combination and one which the local Democrats agree would work fairly well across the whole country.


25 March

McClellan inspects the Illinois militia.
Their drill is somewhat lacking, and when he requests that some men demonstrate target practice they prove unable to aim past 100 yards or so even if armed with rifles; this he considers another major problem, making the note that a large but ill-trained army is no more effective and much more costly in lives than a smaller and better trained one.


26 March

Date for Dybbol assault is set, as being the last day of March. The rate of firing actually decreases slightly for the Prussian artillery, to ensure that more of the guns will be available for the final bombardment immediately before the assault - they have proven more able to temporarily disable Danish heavy guns than to permanently put them out of commission.

27 March

The Dictator is launched in New York City.
She rides a little low in the water, but not as badly as the Casco debacle (it is estimated she will have 16" of freeboard in standard load conditions, an improvement over the Cascos which would have been underwater), and will be fitted out over the next year.


29 March
A battle takes place to the northwest of Dybbol, as the Prussian I Corps repel an attack by a Danish division. A notable feature of the engagement is the Danish use of grenades, which is executed with sufficient skill to draw admiring comments from the Prussian defenders (and to make a composite brigade fall back, before the embrasures are swept with Dreyse fire from the reserve battalions.)
Based on this battle, the decision is made to step up the Dybbol attack by one day.


30 March
Battle of Dybbol.
The Prussian forward positions are about four hundred metres from the Danish ones, and the calculation of the staff is that this will take about five minutes to cross with the last hundred yards at the double-quickstep. As five minutes is considered too long to maintain surprise, instead the artillery opens fire at maximum rate thirty seconds after the assault steps off.

Rather than repeat the three-phase assault that was successful at the Dannevirke, here a two-phase assault is employed with a substantial reserve ready for exploitation. The first line have bayonets fixed and their rifles loaded, but are under strict orders not to open fire until they reach the fortifications ("touched them with your bayonets" is the language used) and the second line are to go to ground and return fire when the enemy is visible and within range. This second line also includes a number of jaegers from German states who rely on longer ranged infantry rifles than the Dreyse, making them a formidable enemy.

The result is a frightful muddle for the Danish defenders, who are under a combination of bombardment from heavy artillery (including some guns firing at extreme range across the inlet) and - as the assault progresses - rifle fire at quite close range, while also dealing with bayonet-armed infantry charging at them and even loud music in German (including what sounds like the British Royal Anthem) coming from a Prussian advance position.
To add insult to injury, all the German cavalry squadrons are charging the parapets as well - even if they are having trouble, they are still a scary-looking threat which must be honoured and it eats up precious time to ward them off.

While the assault is taking place, a land-naval battle is also commencing. The Niels Juel has steam up, and begins to pull the Frederick VI into position to rake the assaulting Prussian forces, but comes under fire from the guns to the south of the inlet - and, as the Prussian infantry reach the parapet, all the other heavy artillery switch to the sea section of the battle as well. The gunners are inexperienced at aiming at moving targets, but nevertheless the two Danish ships become the centre of a forest of shellbursts (every Prussian gun is firing at or near maximum rate, though this has already caused more than one jam) and before long Niels Juel has taken mobility damage - and the Frederick VI is on fire.

Signalling from the shore, de Meza insists that the two wooden ships fall back - this is a job for the ironclad, which is now available. He also sends in his reserves to the struggle over one of the revetments, where the Prussians have gained the parapet but not yet consolidated their position and are still relatively few in number.

The Rolf Krake slides past the listing Frederick VI and opens fire, each of her guns producing a terrific amount of noise and smoke (though the impact is not much compared to what Frederick VI could achieve) and this heartens the Danish defenders - until, that is, the Prussian trump-card makes itself known in the form of two 24-lbers specially selected as the ones in the best condition, moved overnight into the band enclosure and held in reserve until now. These fire steel rounds with a 2lb overcharge at a range of a little over 200 yards, and the resultant penetration of Rolf Krake's side (though achieved only due to a combination of cold weather reducing the armour efficiency and the guns being fired at a dangerous overcharge) causes the ironclad's commander to panic and retreat - having felt himself invulnerable, the sudden proof this is not the case is too much under the conditions (all the other Prussian heavy guns are firing on him as well, and any of the shells could be an armour piercing round in his mind).

With Rolf Krake goes the Danish morale, and the Prussian capture of the redoubt is no longer in doubt.

The Danish situation is punctuated later in the day when the Frederick VI, burning and abandoned, suddenly explodes as the flames reach her magazines.


31 March

Faced with a German threat to the island of Als, and with evidence that a crossing to this island can successfully be covered (and thus that theoretically all of Jutland, Als and Odense could be taken) the Danish parliament - and king - sue for peace, accepting the German Confederation's latest offer.
With this acceptance, the Danes are required to pay an indemnity (which is fairly small, all things considered) and the Danish Union renounces all claims on Holstein - that is, the inheritance laws of Schleiswig and Holstein both are followed, thus splitting the two duchies apart.
This violates the London Protocol, but most in Germany feel this is an acceptable result.


1 April
The British Parliament determines that the peace terms in the "Holstein War" are acceptable to Great Britain as they currently stand.
 
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