I think it might be reflective essay, because you're reflecting on something that already happened.
But you might wanna make sure.
Yours blanks will be filled as followed,
1st Blank - Hannibal
2nd Blank - army
3rd Blank - war
4th Blank - Alps
Think about it, 16 years old? You become a adult when you turn 18. You would also have to be more responsible because 18 is the age you're actions have huge consequences. If you're 16 the worst that could happen is that you get grounded!