The Cumans, memorable antagonists from the first game, reappear in Kingdom Come: Deliverance 2, initially in a side quest titled "Invaders." This guide explains how to locate their camp within this quest.
How to Start "Invaders" in Kingdom Come: Deliverance 2
The "Invaders" side quest becomes available relatively early in Kingdom Come: Deliverance 2. A couple of in-game days after parting ways with Hans Capon, return to the inn in Troskowitz and speak with the innkeeper. She'll mention the unsettling presence of Cumans and request your assistance in serving them.
This initiates the "Invaders" quest. You can choose to serve the Cumans or refuse. Regardless, a conflict between the Cumans and townsfolk will erupt. Your dialogue choices will determine which side you're forced to support.
After the fight concludes, the Cumans will depart, and Vuytek will task you with preventing their return to Troskowitz.
Kingdom Come: Deliverance 2 Cuman Camp Location
To find the Cuman camp, some preliminary investigation is helpful. Travel to Semine (located far southwest of Troskowitz) and speak with Lord Semine to gather information about the Cumans.
The Cuman camp is situated southwest of the Nomads' Camp, itself located west of Zhelejov. The map below clearly shows its location.

You can safely pass through the Nomads' Camp during the day. A path leading downwards will take you to the Cuman camp. Interact with the Cumans to advance the quest.
This concludes the guide on locating the Cuman camp and completing the "Invaders" side quest in Kingdom Come: Deliverance 2. For more Kingdom Come: Deliverance 2 tips and guides, check out The Escapist.