In the third part of Princess Zhu Huan, how did Xiao Jian and Wei Zi know that Erkang was in Myanmar? And it may be Tianma! ! (See supplementary question)

In the play, Xiao Jian said that when he was fighting, he suspected that Musha was a woman, so he asked someone to inquire. As a result, he said that there was an injured Qing general in the palace. He was not sure if it was Er Kang, but he brought back a poem written by the so-called "Tianma" when he was practicing calligraphy. Wei Zi recognized this as Erkang's note. They just think that they went to Myanmar to rescue Erkang.