This quest begins immediately after Honor and Enemies. In preparation for the siege of Paris, Eivor joins Sigfred in capturing Defender’s Rest, a staging ground for catapults which can be used during the siege.
Follow Sigfred to Defender’s Rest
You’ll find Sigfred waiting near a watch tower in the north of Paris, overlooking a public execution. Approach him to begin a cutscene, during which you’ll see the brothers Gozlin and Ebels conduct the execution. After the scene, follow Sigfred along the rooftops until you reach Defender’s Rest, to the southeast of the watch tower.
When you reach Defender’s Rest, Sigfred and his warriors will attack. All you need to do here is join them and eliminate all the Frankish soldiers. You can join Sigfred on the ground, or you can take to the ropes which connect many of the buildings and towers above. This will give you a good view of the area, and provide the opportunity to use some nets of rubble to kill multiple enemies at once, by shooting at the link holding the nets in place. Once all the Frankish soldiers are eliminated, a brief cutscene will follow with Sigfred, and the quest will complete.