(Non-game) Art of Vietnam's Trần dynasty

Higher resolution: https://commons.wikimedia.org/wiki/File:The_Mahasattva_of_Truc_Lam_leaves_the_Mountain_竹林大士出山圖.jpg
Handscroll: Retired king Nhân Tông returns to the capital from Trúc Lâm buddhist temple and meets his son, king Anh Tông.
Author: Trần Vũ (1275-?) and others ?
Date: Sooner than 1363, collected by Chen Jianru in 1363.
Description: Was stolen by Ming Chinese in 1407. Has ink seals of Yongle and Kangzi emperor. Was taken outside by emperor Puyi in 1922. Now it is presented in Liaodong museum.

What is the purpose of this thread? This is not clear to me.

In the right: Viet soldiers and warriors. For referring, Viet warriors did not wear conical hat.

nón lá