News about the fallen South Yamanashi Stronghold soon reached the border. The allegiance of the East and West Yamanashi Strongholds proved effective, and they could take down their common enemy. Because of that, they both gained the North and South Yamanashi Stronghold and decided to halve it.
There needed to be more arguments about how they'd divide the land. But in the end, they were able to settle on halving both the north and south, claiming one-half of each so they could cater to each other preferences.
However, it should be mentioned that this time was the most sensitive as they were still cautious about everything else. As such, their security became tighter. Although they had sworn allegiance to each other, there was a great chance that one might betray the other.
