At the beginning of Arrive Unexpected, Stowe will suggest that you try to approach the camp for a peaceful resolution before committing to an attack. You’ll have three dialogue choices here:
“We will try it your way, Stowe.”
Stowe attempts to convince the guards in the camp to leave. Some of them accept, allowing them to live, but others will fight.
“We would lose the element of surprise.”
You commit to a direct attack and kill everyone in the camp with Stowe and Erke.
“I will go in alone.”
Eivor goes in alone, and you can kill everyone in the camp in whatever way you choose.