Lub Su instructed Taishi Ci and his group to head east once the navy was assembled, not to conquer anything, as the Japanese Island during the Late Eastern Han Dynasty wasn't worth conquering. Accurately speaking, they weren't even considered enemies. Naturally, shallow and even surface gold and silver mines were truly valuable, because given the technology level of this period, the difficulty of extraction was more critical than the reserves.
The primary reason for sending Taishi Ci eastward was to experiment with another model: when our naval combat capabilities are far inferior to the opponent, we switch to a different model, the so-called long-distance detour landing strategy.
This method places considerable demands on the materials that can be carried. If transporting troops, the demand for supplies will significantly increase. More importantly, if as Li Youu imagines, cavalry is to be transported, the demand for materials is no joke.
