Having to deal with a bomb scare on his first day was a real baptism of fire for John.
Baptism-of-fire Sentence Examples
It was here the new Egyptian army received its baptism of fire and acquitted itself very creditably.
The Rhine campaigns were entirely unimportant, and are remembered only for the last appearance in the field of Prince Eugene and Marshal Berwick - the latter was killed at the siege of Philippsburg - and the baptism of fire of the young crown prince of Prussia, afterwards Frederick the Great.
I congratulate you, Count, on your baptism of fire!