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