To the threat of real estate (14) by a longitudinally extending flat web (16) engaging projectile (15) to be able to successfully by discouraging even during only a small rest clearance, the approach trajectory is detected (16) by sensor means and of at least one property in the environment away from (14) installed firing mechanism (12) at least one defense missile (13) started. Whose starting direction (20) is not oriented at the current location of the threat, but they tend to be relatively closely in front of the property runs (14), approximately transversely with respect to the current approach trajectory (16), so as to fall into line counter to then the projectile is ignited (15) frontally in this web (16), to the repelling-Warhead (23) in the head-On meeting constellation at about minimum clearance.