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