One of the most interesting weapon of the FW190 was the SG 113A "Fostersonde". It was a couple of 77mm antitank-recoiless guns installed vertically in the wings of the plane. When it was passing above a column of enemy tanks , these weapons were activated by the electromagnetic field generated by a tank and began to shot downward, penetrating easily the little armor on the superior part of the tanks. This weapon was employed particularly on the eastern front.