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 counter airborne landings, obstacles like wooden barriers were employed, which could cause severe damage to glider wings and lead to fatalities among soldiers, much like the use of grenades or S-mines (Bouncing Betty) targeting paratroopers.