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
attacker loses X, defender loses X
Skirmish 2
attacker loses X, defender loses X
Skirmish 3
attacker loses X, defender loses X
Skirmish 4
attacker loses X, defender loses X