Wikipedia
Leśni
Leśni (short for , Polish for "forest people") is an informal name applied to some anti-German partisan groups that operated in occupied Poland during World War II.
The "forest people" groups comprised mostly people who for various reasons could not operate from the communities they lived in and had to retreat into the forests.
Unlike most organized resistance groups, such as the Home Army, the "forest people" formed a sort of standing army, as opposed to regular partisan units that gathered shortly before an operation and afterward returned to their homes.