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