I just finished a game in which japan went wild. grabbed rabaul, guadalcanal, tarawa, the phillipines, all of new guinea, sydney and threatened india. on average they had something like 3 forts two infantry + planes on each island until their air force was completely destroyed around turn 20. I lost a ridiculous amount of infantry. on one attack 13 infantry 2 artillery and 2/3 planes attacked something like 4 forts and infantry that were out of supply. only the 2 artillery survived-brutal