Two attacks at wounded guard:
Rolled 1d20+9 : 7 + 9, total 16
Rolled 1d20+9 : 1 + 9, total 10
Two attacks at another guard:
Rolled 1d20+9 : 1 + 9, total 10
Rolled 1d20+9 : 13 + 9, total 22
One attack each at the other two guards (iterative; -5):
Rolled 1d20+4 : 11 + 4, total 15
Rolled 1d20+4 : 2 + 4, total 6
Damage (all piercing):
Rolled 1d8+13 : 4 + 13, total 17
Rolled 1d8+13 : 2 + 13, total 15
Rolled 1d8+13 : 8 + 13, total 21
Rolled 1d8+13 : 4 + 13, total 17
Rolled 1d8+13 : 4 + 13, total 17
Rolled 1d8+13 : 3 + 13, total 16