Is it just me or does the defender have a highly exaggerated advantage? During two separate turns in two separate games I lost 5 armies while attacking a territory with a single army defending. In the second turn, I lost a total of 11 armies while trying to conquer a single territory with 3 armies ...

This reply may come too late, but I just finished a javascript program to determine, once and for all, which side has a statistical advantage.

Provided that my logic is sound, the defender has a 55% to 45% advantage over the attacker in any given 3 to 2 dice roll.

Here's how I arrived at it:
If ...