Originally, with Jin Country's support, the combined forces of the two countries didn't reveal a significant weakness.
But if Jin Country were to withdraw its troops and leave only Zheng Kingdom behind, that weakness would be exposed for all to see.
If Tang Kingdom could defeat Zheng Kingdom first and then turn to face Xu State in a decisive battle, with Tang Kingdom's slightly superior national strength compared to Xu State, the chances of winning were quite good.
However, even if Tang Kingdom won, having consecutive victories against two formidable enemies would undoubtedly result in a significant loss of vitality.
This would be a case of both sides suffering heavy damages.
That was exactly the situation Chu State wanted to see.
If things really turned out this way, even without obtaining Qingyun County, Chu State would still come out on top.