In games with chained fortification, if I have more than one army in a territory neighboring the enemy and a bunch in another adjoining territory, I will usually reinforce the lesser territory up to four armies and take a "pot shot" three-dice attack from there to (a) waste some armies out of a territory I'll never use again and (b) soften the enemy territory for the main assault from my other armies. I have to be careful, though, so as not to overcome the defenders with my first foray, so I usually only do this at territories occupied by more than two enemy armies. This is practically the same thing as attacking from multiple countries, and is as close as you can get in the game of RISK. Of course, I do love suggestions!
