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