Zasieki

Zasieki (plural of zasiek) is a Polish term referring to a type of field fortification or obstacle, historically used to impede the movement of enemy troops, especially cavalry and infantry. Zasieki were typically constructed from felled trees with sharpened branches facing the enemy. The trees were often interwoven or anchored to the ground to make them more difficult to remove or bypass.

Zasieki differed from simple abatis in their scale and the intent to create a more substantial barrier. They could stretch for considerable distances, forming a continuous obstacle across a field or strategically important area.

The primary purpose of zasieki was to slow down enemy advances, disrupt formations, and channel attackers into more vulnerable positions where they could be targeted by defending forces. They also provided cover for defenders.

Zasieki were used extensively in various conflicts throughout Polish history, from medieval battles to more modern warfare. They were particularly effective against cavalry charges, as the sharp branches posed a significant hazard to horses and riders. While effective, zasieki were relatively time-consuming to construct, requiring significant labor and access to suitable timber. With the advent of more advanced weaponry and tactics, their use declined, though the underlying principles of creating field obstacles remain relevant in modern military engineering.