This war broke out about seven years earlier than in the dream, causing many details to change accordingly.
For instance, the combat power of Liang Country is not as strong as in the dream. On one hand, their Dayan side has become stronger, and on the other, Liang Country's second formidable general is still in the process of being subdued.
If they actually waited seven years to go to war, they would have to deal with both Chu Feipeng and that formidable general.
Thus, it's inferred that Jin Country's troop deployment wouldn't be exactly the same as seven years later.
This is also why Gu Jiao is determined to gather military intelligence.
Gu Jiao's Red-Tasseled Spear is too conspicuous, so she left it at the military camp in Quyang City. Her weapon is a whip she took from Gu Chengfeng.