He had a wet dream and was unable to do ghusl, so he did wudoo’ and prayed

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Check below answers in case you are looking for other related questions:
How can a person who is partially paralyzed do wudoo’ and pray?
Differences between semen (maniy) and urethral fluid (madhiy)

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Related Answers:
His wife cannot do ghusl because of sickness; can he have intercourse with her and let her do tayammum?
He is suffering from a skin disease on his lips – how should he do wudoo’?
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How can a person who is partially paralyzed do wudoo’ and pray?
Differences between semen (maniy) and urethral fluid (madhiy)

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