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