Does South Song Dynasty Inherit the Tactics of "Defending the Inner Part and Making an Empty Show of Strength Outside" Practiced in North Song Dynasty?

It was one of the three state policies made by North Song Dynasty to defend its inner part and make an empty show of strength outside in the early days and this strategy continued till the end of South Song Dynasty. For a long time, scholars in the field of history accepted this view. However, the writer thinks that compared with North Song Dynasty, the situation both at home and abroad in South Song Dynasty was different. The situation along the borders in South Song Dynasty was more serious than that in North Song Dynasty. Thus it decided that South Song Dynasty could not regard it as its state policy. She had to defend its outside part and inside part as well.