Don Colton's Risk Dice Roller

(Risk is a trademark of Parker Bros / Hasbro for their board game.)
Wikipedia Article, Attacking

How many attacking armies
How many defending armies
How many skirmishes (max)

Skirmish 1   4 6 1   5 5 attacker loses X, defender loses X
Skirmish 2   2 2 5   4 3 attacker loses X, defender loses X
Skirmish 3   3 6 3   1 5 attacker loses X, defender loses X
Skirmish 4   3 1 2   6 3 attacker loses X, defender loses X