Prigozin tried to go against Putin with actual army. And he was naive enough to think that he can shot at the king, miss and live.
When it happened it seemed that the emperor was naked and nobody would protect Putin.
All the military ordered to stop him just did not do anything or joined them.
Tried to bomb him but plane was shot down and that was that.
Only problem is Prigozin called it off, he likely forgot to hide his family
Someone more ruthless in his place could have done more