How many units do you use to attack a dead zone territory? Is there a formula or computation that can be used to discover the optimal number of units to attack with?
Consider the Eastern European front with Russia holding Karelia and Germany holding Eastern Europe, with the Ukraine as a dead zone (3 IPC). Presume Karelia has sufficient infantry support to resist a German invasion and vice versa, and that the only sort of attacking that's going on at this stage in the game on this front is the tit for tat taking and retaking of Ukraine.
Now, say it is Russia's turn and that they have, say, 25 infantry in Karelia and 2 fighters and Germany has one infantry in Ukraine. How many troops does Russia attack with given two fighters? What if Germany has two infantry in Ukraine? What if Russia has only one fighter?
I'm curious if there is a general formula for ascertaining the optimal attack ratio. Using a calculator like this one seems a necessity, but what sort of likelihood of winning the attack do you aim for? 60%? 80%? Higher?