Cahir leads the Nilfgaardian army in battle against Queen Calanthe, King Eist, and Cintran army in a field just outside Cintra. Queen Calanthe and King Eist defend Cintra from the Nilfgaardian invaders, as opposed to waiting for aid from their fleet of ships that was delayed by a storm. The Nilfgaardians' sheer force in numbers allow them to overwhelm the Cintran army, and after King Eist is killed in battle from an arrow in the eye, fired by Cahir, Queen Calanthe is forced to retreat.
Nilfgaard have made their way to the city, and now Cintra is under attack. They eventually make it inside and begin slaughtering the people within Cintra's walls. Cahir spots Princess Ciri as she's being escorted out of Cintra on horseback. As Ciri and Sir Lazlo attempt to flee the city on horseback, Lazlo is killed with an arrow by Cahir, pulling Ciri off the horse and onto the ground. Ciri watches from the back of Cahir's horse as Cintra burns. She screams, releasing a powerful magical pulse that frightens the horse and causes it to knock them both onto the ground. Ciri screams several more times, releasing energy so powerful that a stone monolith collapses and creates a chasm in the ground itself, allowing Ciri to escape.
Searching for Princess Ciri
Cahir and his men invade a Cintran refugee camp in the late hours of the night, slaughtering everyone in their path, in search of Ciri, who manages to escape unseen.
After conquering Cintra, Cahir and Fringilla search for Queen Calanthe's body. They find her on the ground, buried underneath the snow. One of Fringilla's comrades slices a piece out of Calanthe's arm and eats her flesh. Fringilla then guts him and is able to determine that Ciri is in Brokilon forest. One of his men suggests sending soldiers in to take Ciri, however, Cahir knows that armies are not the way into Brokilon forest.
Retrieving Ciri from Brokilon Forest
Cahir seeks out the help of a doppler in order to retrieve Princess Ciri from Brokilon forest. Cahir takes him to Mousesack, who they've captured. Cahir orders the doppler to take on his appearance. Cahir releases Mousesack from his chains only for the doppler to tackle him to the ground and shape shift into him, before stabbing Mousesack with a knife. After killing him, Cahir demands that Ciri is brought to him alive.
Cahir captured Ciri in the woods as she fled from the Adonis. If it had been any other way to extract Ciri, he would’ve done it. All he’d ever wanted was to fulfill her destiny. The White Flame had brought them together. She was the key to everything. As Cahir was fetching something to eat, he was confronted by the Adonis, who had taken on his appearance and in doing so, discovered what Ciri truly was. A fight ensued and Cahir was stabbed in the process, allowing the Adonis to escape.
Cahir murdered everyone inside the tavern to insure they weren’t the doppler. As Fringilla cleaned his wound, he remarked that a simple test of silver would’ve sufficed. Fringilla stated that they could pull more soldiers and keep searching for Ciri. Fringilla reminded Cahir that it was he who rose up against the Usurper and helped free their people from their chains. She witnessed the White Flame crawl on him and anoint him. Ciri may be the key, but Cahir was the commissioner. They will find Ciri and spread the White Flame’s supremacy throughout all kingdoms.
Battle of Sodden Hill
After discovering that the Brotherhood was fortifying the keep, Fringilla reported back to Cahir to alert him of their arrival. The field Marshall recommended that they fall back, but Fringilla desired to move forward with the plan. This was their chance to honor the White Flame. Cahir refused to lose Princess Cirilla and ordered Fringilla to tests the Brotherhood’s defenses.
Fringilla and Cahir watched from the top of the hill as their men were taken out by the brotherhood. They were forced to move to the other front. Vilgefortz portalled to Cahir’s destination, taking out half a dozen soldiers before getting to Cahir. During the fight, Vilgefortz was disarmed multiple times, each time using magic to return his sword, despite Yennefer’s warnings to reserve his chaos. Vilgefortz is bested by Cahir and with his chaos depleted, Cahir kicked him off the hill. Cahir rolled down the hill and hit his head on a tree stump.