This second option was quite troublesome, as the four countries had spent a lot of effort building so many isolation barriers. Some isolation barriers were even underground or within mountains, making it incredibly difficult to get rid of them.
Zhao Fu first had some people investigate to see how long it would take to get rid of those isolation barriers, and he found out that it would actually take three to four months. As such, Zhao Fu could only choose the first option, as having the entire army quickly move through two regions would only take about a month.
These four countries had spent a great deal of effort to resist Great Qin, but all of it would be for nought. A trace of coldness appeared in Zhao Fu's eyes; after conquering them, he would deal with them severely.