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