After Kailamez's departure, Nilfgaard's army brazenly invaded the kingdom of Sintra, an act that immediately stirred the nerves of the northern kingdoms. For, after Sintra, it was the first kingdom of Nilfgaard with the northern kingdoms, Temeria and Aden. And according to the current situation of Nilfgaard, he will definitely not stop making peace, and the pace of his aggression will continue to increase. Thus, in the face of the invasion of Nilfgaard, for the first time, the northern nations united against the invasion from Nilfgaard.

However, the northern states had been prepared in a hurry, and their armies had not yet fully marched into Sintra to engage in direct confrontation and all-out war with Nilfgaard. Thus, while Nilfgaard invaded Sintra, only Sintra's army was fighting against Nilfgaard. And the northern countries have only been supporting Sintra. However, as a small country, Sintra is naturally weak compared to Nilfgaard. Although the soldiers and civilians fought bravely, they were constantly repulsed as Nilfgaard advanced step by step. Immediately, Enshir Enreis demanded that Sintra surrender, but Ciri's maternal grandmother, Caranthor, refused to surrender and committed suicide. However, Nilfgaard still did not fully occupy Sintra. It was also because of the defeat of Sintra that the northern kingdoms were determined to resist Nilfgaard.

An army of 100,000 men was gathered at Mount Soden, and twenty-two warlocks joined forces with the northern nations against Nilfgaard. Logevan's Wigofortez commanded the mages, and the Northern Kingdom relied on the help of the Warlocks to secure victory in the war. But the victory didn't stop there, because after this battle, Sintra fell completely, and the territory of the Nilfgaard Empire became even larger. It is said that 30,000 people were killed or wounded in the battle.

Fourteen of the twenty-two Warlocks were killed in the battle (according to official statistics, only twelve bodies could be found due to the mutilation and illegibility of the corpses at the time), and Triss Melligard was also miscounted and her name was engraved on the monument, so she is also known as the Fourteenth Martyr. In fact, she was severely burned in battle, but did not die, and was magically restored to her appearance after being rescued by the Warlock Brotherhood. Yennefer lost her sight during the battle, but she was later able to regain her sight through magic, but the experience left her traumatized. The battle resulted in heavy losses on both sides, and an armistice was brokered by Logevan's Wigo Fortez. The end of the First Nilfgaard-Northern War.

In the original history, the warlocks involved in this battle were Franceska, but because of Jiangning. Francesca did not participate in the battle, but an unknown warlock did. Therefore, neither the survivors nor the outcome of the battle are much different from the original history.

The end result was that Nilfgaard gained Sintra, and Temeria took the opportunity to expand his territory. The only loser was the Kingdom of Sintra, which became the northernmost province of Nilfgaard. The peace negotiations between the nations were actually negotiations between the warlocks and the monarchs behind the scenes, and this war also increased the influence and voice of the warlocks. If, as in the original history, Francesca participated, then it belonged to the kingdom of Aincidi, and the Valley of the Hundred Flowers would be established after the end of this war. Unfortunately, Francesca was not involved, so Einsidi's situation did not improve much.

However, the greatest success of this campaign was undoubtedly Temoria. Nilfgaard, on the other hand, gained Sintra, but lost all the territory he had gained in the war. And he lost most of his troops and generals, but he didn't get what he wanted. Therefore, the Nhil Syriss of Nilfgaard was not reconciled at all.

As a result, various actions are frequently used, such as reaching out to the Warlock community to gain their support and allegiance. In the previous battles, the Warlock group helped the northern countries to win and lay the foundation for victory. Their influence and voice have also increased, so some people still want to continue to increase the influence of the warlock community. Thus, in the time that followed, the group of warlocks was divided into three parts. One is a warlock from the northern kingdoms, some is a neutral, and some is a Nilfgaard.

They quarreled and quarreled, and eventually, it was decided to hold another meeting on Sunnid Island. At that time, many warlocks and mages traveled to the Isle of Sunnid to participate in the mage council, in order to determine whether the mages were inclined to favor the Northern Kingdom or Nilfgaard, or to remain neutral. However, the mages loyal to the Northern Kingdom intend to accuse their peers of being complicit with Nilfgaard, and on the other hand, the conspirators intend to carry out a coup d'état against the other participants. They landed the Squirrels and Nilfgaard's agents on the island, which eventually led to conflict and bloodshed. Many members of the two factions died in the bloody battles that ensued in the palace. In the end, the traitors were forced to flee for their lives, and not only did several warlocks die on both sides, but even the warlocks of the neutrals also lost a lot of their lives, and even Geralt was seriously injured here, and was then teleported by Triss to escape from the area. After this incident, the influence of the Warlock community in the Northern Kingdoms was greatly reduced, and many Warlocks lost their previous positions as royal advisors in the Northern Kingdoms.

The influence they had gained from helping the northern nations against Nilfgaard had been greatly reduced or even less than before. Because of this coup d'état, the Warlock Council collapsed, and the influence of the Warlocks plummeted with the collapse of the organization. At the same time, King Vizmir II, one of the northern kingdoms, was assassinated, and part of Leiria's army was besieged in Aden. Subsequently, the northern states used this as an excuse to start a war and attack Griwisingen, and the Second Northern War broke out.

It can be said that the Second War of the North was entirely a war in which the northern nations intended to drive Nilfgaard back to the South. They wanted to take this opportunity to reclaim Sintra, hold Nilfgaard's outstretched claws firmly against it, and drive it back to the south. Don't let him get involved in the north, and Enhil is also dissatisfied with the loss of territory in Soden and other places because of the previous war, so he also wants to expand his territory again through the war.

Therefore, when the northern kingdoms entered Griwisingen, Enhir used this as a pretext for a second full-scale war!