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