Of course the F-117 and the B-2 were 'stealthy' over Serbia. We only lost one jet. When we asked Serbia why they managed to shoot down only one, they turned tail and ran.
Yes they were stealthy but not invisible. They were constantly flying on altitudes that were above range of our anti aircraft defence. All missions were also consistently supported with SEAD operations, by F16CJ (Viper Weasel) and EA-6B Prowler, armed with HARM rockets, and carrying AN/ALQ-99, AN/ALQ-149 and AN/ALQ-126 containers. Prowler's flying from USS Theodore Roosevelt where caring two HARM rockets each, but those from Aviano where flying with only jamming equipment, and because of that were paired with F16CJ or Tornado ECR. Typical SEAD group consisted of 2-4 EA-6B and 4-8 F16CJ. For example 22. EFS from Spangdahlem was flying supporting missions for F117A. Those SEAD groups were supported by AWACS, ABCCC and RC-135 aircrafts, which were sending them informations about Serbian anti aircraft defence. And since F 16 CJ were not carrying containers with LANTIRN systems, they were not capable to use laser guided bombs, but they were sending informations to F15E or F16CG aircrafts, which were capable to do DEAD missions with guided or cluster bombs. According to NATO during the war 743 HARM missiles were fired on Serbian forces.
So it's kind of understandable that Serbian air defence had huge problems in this war. They were constantly jammed and hunted by far superior enemy. So they were forced to adopt different mode of operation, or risk to be destroyed in first days of war. So according to this Serbian air defence relied on maneuver, use of decoys and shortened radar transmitting time.... All of this resulted in not so spectacular results when we talk about shooting down of enemy planes. but because of this NATO was forced to use strong SEAD forces through whole war, and to fly on high altitudes, which largely hindered them in finding and destroying Serbian forces on the ground.
For example:
War: Combat flights: SEAD flights: Percent:
Vietnam: 219.407 11.389 5.2%
Desert storm: 68.150 4.326 6.3%
Deliberate force: 2.451 785 32%(Bosnia)
Allied force: 21.111 4.538 21.5%(Serbia)
And when we talk about F117A, he was visible for the Serbian air defence since the beginning of the war. Serbian air defence was not capable to defend the whole country. They were practically defending certain zones. But following the NATO communications we were capable to see that strike groups of F117A were always using the same corridors, so we were able to practically ambush him. One more F117A was damaged during the war (tail damage). Safely landed in Spangdahlem. Some other aircrafts were also damaged. For example two A-10 were hit by MANPADS, but they safely landed. Some 30 UAVs were shot down, and many cruise missiles also.
And one more thing for 78 days our soldiers were fighting against the world most powerful countries. Some of our pilots where flying in a missions of 1 or 2 against dozens of enemy aircrafts. Our ground attack aircrafts were flying support missions while the sky was completely controlled by far superior NATO forces. And yes in the end we lost, not a really big surprise. But we did not turn our tail and ran as you said, we fought and we lost, as simple as that.