This creates the word encampment, which means:
* A temporary camp, especially one set up by soldiers or nomads.
* The act of setting up a camp.
Here are some examples of how "encampment" is used:
* The soldiers established an encampment near the river.
* The nomadic tribe moved their encampment every few weeks.
* The festival was held in a large encampment on the outskirts of the city.
While other suffixes are possible, they are not as common or natural-sounding as "-ment".