Below you can find the probabilities for an army of x conquering an adjacent territory with an army of y (assuming random dice). So for example the probability that you can take out a territory with 3 defenders, using an army of 7 is 89%.


0 1 2 3 4 5 6 7 8 9 10
1 100% 0% 0% 0% 0% 0% 0% 0% 0% 0 ...