Why did Liu Bei take Lingling Guiyang first after he captured Nanjun?

1. First, strategic needs. Sun Quan is in the east of Jingzhou, but the troops in the southwest are relatively empty, and there is no backup for this part of the troops.

2. On the other hand, ancient land transportation was limited by natural conditions, and relatively large cities were built by water. Guiyang and Lingling are such cities, and they rely more on waterways when dealing with such urban warfare, which may be another factor to attack these cities first.