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