The war started in 1607 with a two-pronged assault by two Danish armies into the former Duchy of Brunswick-Lüneburg. As the war goal was to restore the Welf dynasty to the duchy, it would be vital to actually control it for the peace talks in the future.
Besides the two armies that invaded the former duchy, men had been mustered across the remaining border to deter a possible push into Mittelmark, from the royal heartlands of Saxony. Mittelmark by now had taken a position in Dania as a very valuable province. While it remained less urbanized than some places in Dania it had a large, only outdone by Denmark itself, and relatively rich rural population. More importantly the nobility was weak in the province. Something which was rare in the southwestern Marks of Dania, which meant that it had become a bastion of royal authority.
For the two armies going into the lands of Lower Saxony, crossing the Elbe River had been relatively painless. As Dania controlled one side of the river, and the infrastructure was good along it due to the close contact that the two previously had held.
The first skirmishes happened in and around Lüneburg where one of the Danish armies objective were to oust the Saxon garrison, secure it and then swing east and south to secure that part of the duchy. The fighting was hard. In the years that Lower Saxony had been under the control of Saxony, they had heavily invested in the defence of a few but vital strongholds. One of these was Lüneburg.
The first siege of Lüneburg did end in failure, a relief force combined with a well-timed sally from the garrison in Lüneburg managed to inflict a defeat on the besieging Danish army. However, it soon became clear that the relief force, even combined with the local garrison, was severely outmatched by the Danish army, which once again managed to cut off the city roughly a month later after the defeat.
The first real battle of the war happened to the west, as the other Danish army marching towards Stade, one of the other modern strongholds in Lower Saxony. Here the Danish army clashed with the army of Burggraf Claus von Der Deckens of Bremen. A native of the Duchy, the von Der Deckens had early on transfered their loyalty from the Welf dynasty to the Ascanian dynasty of Saxony.
The von Der Deckens had been raised to undeniable prominence in the northern and western part of the duchy, due to the loyalty shift. The young Claus von Der Deckens, had been quick to raise the forces of the area to oust the invaders. But his army did not consist of the disciplined and lethal troops of Saxony, but levies and a few remnants of the old army of Brunswick-Lüneburg. The core of his army was two regiments of Saxony infantry and one regiment of horse. Just shy of 5.000 reliable troops out of the 20.000 he commanded at the Battle of Steinkirchen. Compared to other battles of the war, this first one was relatively unremarkable and Marsk Sigurd Gyldenløve commanding both a larger army and one of better quality, was victorious in the this first clash. Resulting in the siege of Stade
Stade
One of the reasons that Dania was as successful as it were the first year of the war, can be explained with that Saxony was surprised by the declaration of war. The court of the Wettin dynasty had perhaps come to the conclusion that Dania was happy with the peace it had enjoyed for several years after the Russian War. This helps explain the inadequate relief force that had marched on Lüneburg, and the ragtag army of Claus von Der Deckens.
Nonetheless Saxony was quick to muster its men after the declaration of war, but the surprise had done its work, and before Saxony was ready to field a proper army, Lüneburg and Stade had fallen to the invaders.
The army that Claus von Der Deckens had raised, had weakened many of the garrisons in the western parts of the duchy, and that helps explain the relative fast fall of Stade, in the same note the Burggraf of Lüneburg was after the war accused of treason and in fact executed. No evidence of Danish bribery exists besides him being executed.
After the fall Sigurd Gyldenløve, would go on to take control of Vörde once an important stronghold, it had seen little of the investment that Stade, Bremen and Lüneburg had in the previous years. Following that Ritzebüttel, more of a pirate haven than a proper military fortress was conquered.
Siege of Vörde
Ritzebüttel was once built to protect the estuary of the Elbe from pirates, but after the enclave had fallen into the hands of Saxony, it had been used for quite the opposite and privateers had been a constant and serious pain for Hamburg during the last two decades.
A story goes that just a few hours after the pirate haven fell to the Danish forces, several ships from Hamburg arrived with soldiers and labours and immediately began to fortify it once again. While undoubtedly an exaggeration, Hamburg did indeed during the war build a new fortress at Ritzebüttel and man it with soldiers. Sigurd Gyldenløve would go on to establish his winter camp near Ritzebüttel.
In the east Duke Frederik of Brandenburg had taken control of the other Danish army, after the fall of Lüneburg, however, he did not have as easy of a time, his advance was checked by his own brother and him and his army would establish their winter camp on the Ilmenau river, just south of Lüneburg.
The second year would prove little better for Saxony, after a month or so Frederik Schultz of Brandenburg forced his brother into battle at Uelzen, a strategic crossing on the Ilmenau river and defeated him there, and just a single week later the decisive battle of Dannenberg happened. Which resulted in the political and militaristic opponent of Burggraf Christian Schultz of Dresden to take control of the Saxon war effort, while Christian Schultz had to defend himself and his actions in the capital of Wettin.
Meanwhile, Claus von Der Deckens would suffer his second defeat against Sigurd Gyldenløve, and withdraw to the city of Bremen. Bremen contrary to both Lüneburg and Stade would prove a hard nut to crack, even if it was cut off from aid both from land and sea. The garrison consisted not only of the original garrison that Claus von Der Deckens had led to war, but also the majority of the Saxon garrison of Stade, combined with the battered levies which also had withdrawn to the city, it was a surprisingly strong garrison. Sigurd Gyldenløve had little choice but try to starve the city or storm it which undoubtedly would mean his army would pay a high price.
Sigurd Gyldenløve would have preferred to starve the city into submission, deeming the risk associated with storming the city too high, but pressure from higher ranks eventually meant that the city would be taken by force. In late November four months into the siege, the infantry of Sigurd Gyldenløve overran the defenders and the city of Bremen, through two breaches in the wall. But it was not without cost as that day was the single bloodiest in the entire war.
The third year of the war would proceed very much like the previous two, meaning sieges with few actual battles. With Sigurd Gyldenløve marching his battered and bloody army towards Oldenburg. Now with his original objective, securing the northern and western parts of Lower Saxony, completed after the fall of Bremen. Though this time he would resist his superiors insistent on speed, and instead he settled for a long siege.
Meanwhile, much like Sigurd Gyldenløve, which had left Lower Saxony, and entered Westphalia, Frederik Schultz, marched from his winter camp at the Ilmenau river, into the heart of Saxony. This campaign year for Frederik Schultz and his army very much centred around the fortress of Wolfsburg as the army would take the entire campaign season to overcome the obstacle that Wolfsburg would prove to be. In May the Battle of Wolfsburg happened, where Frederik Schultz would prove his mastery over the Saxon commander, Burggraf August Haugwitz of Magdeburg.
This battle besides being a somewhat inconclusive victory for Dania, also resulted in Frederik Schultz not participating in the remaining war, due to one or several wounds he acquired during the battle. He survived, but was first returned to the occupied Lüneburg and later his estate in Mittelmark where he would recover.
Wolfsburg much like other Saxon fortresses, besides Oldenburg, eventually fell and the Danish army, now led by Valdemar IX himself made preparation to march on Magdeburg, the largest and richest city of Saxony.
The threat to one of the most important cities of Saxony, would see Christian Schultz return into favour again, and take command of the efforts to protect the city from the invading Danish army once again, during the latter months of the third campaigning season and early months of the fourth Valdemar IX and Christian Schultz armies would clash several times in indecisive skirmishes. But finally, at the Battle of Magdeburg, Saxony would find the victory they had been denied so far, in an arguably more decisive battle that Dannenberg earlier had been.
Yet the damage had been done and three years of near continuous losses on the battlefield, even if siege warfare had been the most prominent feature of the war had made its impact. The political infighting among Saxony’s high command had put them in a position where Dania quickly had gained their war goal of securing the former duchy, and with Oldenburg under siege and Danish forces mustering once again not far from Magdeburg. Saxony agreed to meet at the peace table during the early months of the fourth year of the war.
The peace of Magdeburg restored the Welf dynasty to the ducal throne of the Duchy of Brunswick-Lüneburg, the former Danish enclaves across the Elbe was restored, to be specific Bremen and Ritzebüttel, which both fell under the influence of the Kronstad Hamburg, though Bremen remained far more autonomous than the other.
Saxony did gain several important concessions, which was instrumental in making them accept the loss of the duchy, these concessions where economical in nature. Saxon traders would gain the same rights that Danish ones did on the Elbe river, in essence while they lost control of the lower part of the river, their trade would not be hampered, and the lack of tolls would make several prominent merchant families in Saxony fabulous wealthy.
The second concession was a share of the tolls earned by Bremen at the mouth of the Weser River. This revenue was also immensely important to Saxony, Oldenburg which had stubbornly resisted the Danish siege would enjoy the most immediate benefits of this. It would replace Bremen as the Saxon strong point in the area.
The lessons that Saxony learned from this war, where important, it was by that point known that the Saxon armies could fight on equal footing with the larger and more establish “great powers” and this war did not change that. What Saxony could not afford was the infighting among the High command of Saxony, during such a war, it had crippled the war effort as Christian Schultz and August Haugwitz and their supporters had fought in letters and in person in the royal court of Saxony over how the war was supposed be conducted.
This lesson was certainly learned, and after the war August Haugwitz lost his prominent military position, and Christian Schultz on behest of the only real Saxon victory, the Battle of Magdeburg, remained, uniting the previously fractured court of Saxony.
In the Grand Kingdom of Moravia, the war had been followed closely with some worry. The war confirmed all but their biggest fears, as Dania continued with its aggressive border warfare, enlarging their already formidable realm. But contrary to the earlier Russian war, Moravia itself had been busy fighting to its south, and as such had been unable to intervene.
The conflict between the Kingdom of Bavaria and the Habsburgs of Hungary had broken out. In the Duchy of Austria, which was under a personal union with Hungary, had lands in Swabia, and for decades relations had been frosty with the Kingdom of Bavaria, which in turn believed that the lands of Swabia should belong to them, especially the cities of Augsburg and Ulm. A belief that was not unfounded, both cities had been granted to Bavaria following the religious wars nearly a century before. But before Bavaria could lay its claim to the two cities, the armies of the Habsburgs had taken them by force.
The western part of the Habsburg realms, with the Austrian enclave and Swabia which Borders the Swizz confederacy, Duchy of Würtemberg, and the Kingdom of Bavaria.
The uneasy status quo had stayed liked that for near on a century, until anew ambitious King of Hungary had unfolded his plan to enlarge the lands he owned in Swabia. Bavaria had not been unprepared for such events and had made allies with some of the few remaining duchies in the area, and of course with Moravia.
The Habsburg realm was unable to deal with both the forces of Moravia, Bavaria and its ducal allies, while at the same time expanding into the Balkans. The loss of the Swabian lands and its western enclave was a prestige loss for the young new King. But it would later be regarded as a blessing in disguise, as the focus of the Habsburg fully settled to its East and South. Where the upheaval of the Ottoman fracture very much still could be felt.