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