I’m not sure that everything was that rosy in the Swedish relations with the Empire and the Brits. Of course, there was absolutely no reason for spoiling relations with them and Charles was too busy fighting the GNW to join WOSS on any side so Marlborough’s “success” simply means that Charles agreed not to do what he was not going to do anyway and for this squeezed some concessions for the fellow Protestants in Silesia. 😂The goal of both Karl XI and Karl XII in foreign policy was to avoid entangling alliances that could start wars for Sweden that Sweden neither needed nor could gain anything from. The loose association and friendly relationship with the Naval Powers (Dutch and English) and understanding with the Emperor had served Sweden well up to this point. Denmark, which wanted to start wars in 1683 and 1688 was forced to back down by Dutch and English support for Sweden, so from the Swedish perspective, the strategy laid down by Karl XI worked just fine.
Karl XI had been furious that France made peace at Fountainebleau 1679 for Sweden without consulting Karl XI, treating Sweden as a vassal state and France had occupied the Duchy of Pfalz-Zweibrücken, which was the personal domain of Karl XI and XII 1671-1697, which also caused resentment. Sweden also supported and rented troops to the anti-French League of Augsburg (primarily the Dutch) during the Nine Years War
Sweden during this era had angered all her neighbours. Lübeck/Hannover wanted Swedish Bremen, Brandenburg-Prussia wanted Swedish Pommerania, Denmark-Norway wanted Scania back (and if possible also other lost territory), Poland-Lithuania wanted Livonia and OTL Russa wanted access to the sea back. Sweden was surrounded by enemies waiting for a chance to pounce, and Karl XI, Karl XII and Piper, who both used as their de facto chancellor also knew it and all supported the OTL policy of friendly relations with the Naval Powers and the Emperor, but no entangling alliances and no involvement with France. Being friendly with the Emperor mostly kept the antagonistic German princes in line - so a pro-Imperial policy also worked out for Sweden during this era.
Karl XI, Piper and XII had no desire for more territory or foreign adventures, and knew that it might trigger a pile-up on Sweden.
When it comes to the meeting between Karl XII and Marlborough in April 1707 in Altranstädt in Saxony, the mutual impoliteness is not mentioned by contemporary sources - the first source is from a French travellerer (de la Motraye) and his criticism of Voltaire's biography of Karl XII, from 1732. He was not present during the meeting. In fact, the meeting can be described as as success for both Karl XII and Marlborough. Marlborough got guarantees that Sweden did not intend to join the French in the War of the Spanish Succession (which was a real fear in the Allied camp at the time, as Karl was recruiting heavily in Germany at the time to reinforce his army). He also got guarantees that Sweden had no intentions to mess around in the Empire at that time. In return, Karl gained the continued British facilitation of good relations with the Emperor, which meant that Sweden's southern flank was secure and that Denmark, Prussia and Hannover would be kept in line and that Karl could continue to recruit in Germany for his army and then invade Russia.
Sweden had a pro-Naval Powers and anti-French policy since 1680, which combined with friendly relations with the Emperor had served Sweden very well, and that Karl XI, Karl XII and Piper, who were the most influential persons regarding Swedish foreign policy, all supported this. As Sweden at this time was more concerned about warding off everyone they had pissed off and keeping the territory it had gained, it had no desire to conquer more territory or go on any foreign adventures.
My bottom line is that Sweden will not join the French side in the War of Spanish Succession, and unless directly attacked, will try to avoid war entirely, especially far away and for little gain in what is the chief goal of Swedish foreign policy at this time - keep what they have gained, keep out of war. Good relations with the Emperor also worked in direct Swedish favour at this time.
But an idea of him joining the anti-French alliance seemingly was discussed seriously and if Marlborough’s statement that he would like to fight a campaign under Charles’ command can be considered as a routine politeness, it is on the record that Peter was offering Marlborough a very serious bribe if he manages to convince Charles to go to the ‘Western’ theater. The Emperor seemingly was afraid that from Silesia Charles may march on Vienna.
Anyway, what would be the reason for Charles, if he decided to join WoSS, to join the Allies? Trade relations with the Brits and Dutch were important but they were mutually important so even in the worst case scenario he would not expect an excessive hostility from them. In OTL he kept the Baltic pretty much closed for years and Swedish privateers had been actively harassing the Dutch on the North Sea. But this was ‘just business’ and both maritime powers had been happy to restore relations at the first opportunity (more or less the same goes for their “hostile-friendly” jigsaw with Russia during the GNW: hostile stages never resulted in some dramatic actions which would be hard to repair later).
Yes, Sweden did participate in the anti-French coalitions before but it fought on the French side either and, if it makes sense, can do this again. Strategic problem for CXII, if he decides to join WoSS at all (which is not granted in this TL) is that for fighting on the Allied side he has to march across the whole Germany leaving extremely unreliable …er… “allies” who hate Sweden and have plenty of uncommitted resources to attack his territories while he is doing all these heroics in the Netherlands or on the Rhine. Would the Brits and Austrians march with him to punish Saxony and Prussia? Unlikely.
What you are seemingly missing is that in this TL he actually does not have to join any side within framework of the WoSS. With Russia being friendly he can proceed with settling the scores with Saxony, Denmark, Poland and Prussia without having France, Britain or Hapsburgs involved and without him joining any side. It is just a separate Little Northern War with its own goals and a realistic possibility to get some territories valuable for Sweden. For example, “return” the whole Pomerania, getting Danzig, annex Courland. Not sure if he may want something from Denmark but you got a picture. The Big Guys are busy fighting each other and it is just fine by him because he can get what he wants with impunity. As a trade block, Sweden-Russia are too important to the maritime powers to make too much of a post factum fuss and Austria can’t actively interfere either when Charles and Peter are going to make their little “pre partition” of the PLC.
But, as you yourself noticed, we are going a little bit ahead of the schedule. 😂
Edit: Just checked two different biographies of Marlborough on the meeting and both are rather on a negative side about the mutual impressions. Charles found Marlborough too overdressed and Marlborough considered him too plain and rough. The juicy details I was referenced to were (IIRC) mentioned in Massie’s biography of Peter (don’t know where he got them) but it looks like the Allies had been fearing two things:
(a) That Charles is planning to create anti-Hapsburg coalition of the German Protestant states (I was under impression that at this time Sweden was not exactly popular with most of them and that geopolitical situation in Germany was a little bit different from one of the GA time but who am I to argue….)
(b) That Charles may join LXIV (what for if so far he was doing just fine on his own without a need to care about somebody else’s interests).
So, in terms of preventing Charles from pursuing these goals, Marlborough’s mission can be considered a smashing success leaving us with an obvious question: was Charles planning to do anything of the kind to start with? 😂
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