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