What happened in the middle of the chapter 11 of journey to Jo'burg?

In the middle of Chapter 11 of "Journey to Jo'burg," Naledi and Tiro encountered a group of soldiers who harassed them and accused them of being spies. The soldiers searched their bags and threatened them, creating a tense and frightening moment for the siblings. This encounter highlighted the dangers and discrimination faced by black South Africans during apartheid.