No it was a lucky shot as well as a result of the extraordinary efforts of the 250th Missile brigade, which learned that they could detect not track the F-117s by using long range wave lengths.  They also learned that the F-117s were flying in relatively direct non randomized routes to targets through past detections as well as targets destroyed.  With this information in hand the 250ths commanding officer, Zoltan Dani, was able to deduce the most probable flight paths and assign mutliple batteries, spotters equipped with thermal imaging devices and laser rangefinders along these routes.  Sure enough an F-117 flew over one of these prepared locations and the the Serbs were able to locate it and then fire several missiles via manual guidance.  One of these missiles was able to explode close enough to the F-117 to force the pilot to eject. 

     Now some things to bear in mind, first the F-117s used stealth materials(paint) which were eroded by high amounts of moisture thus significantly diminishing its stealthiness.  Second the F-117s bay doors are not as shall we say muscular as that of the B-2 and F-22 and as a result must remain open for a comparatively longer period of time.  Finally the the complacency of US planners which did not apply an appreciable effort to confuse Serb aerial defenses with respect to the flights of stealth aircraft.

 

THanks for the clarification.  I have also heard that the stealth plane was brought down by skilled planning.    The version I heard was that the plane was optically / thermally tracked and then SAM-6s were launched towards the projected flight path.

 

The guidiance Radars were turned on while the missiles were in mid flight allowing for fine corrections.   Therefore,  the Pilot's ECM systems only gave a very brief warning before a missile exploded nearby