Obstacles, such as wooden poles, were used to hinder airborne landings, which could tear the wings of gliders and kill the soldiers inside, as these poles were connected with wires to either these grenades or S-mines (Bouncing Betty) against paratroopers.
To prevent successful airborne landings, obstacles like wooden barriers were used, which could cause significant damage to glider wings and result in fatalities among soldiers, as the poles were connected by wires to either grenades or S-mines (Bouncing Betty) targeting paratroopers.