In this scene, the North Vietnamese soldiers invaded the refugee camp. They attacked/killed many people that were in the camp. Loung Ung and her siblings were trying to escape the North Vietnamese soldiers.
In this scene, Loung Ung and her siblings/friends were trying to hide behind a South Vietnamese soldier so the North Vietnamese soldiers would not kill them. One of Loung Ung's friends tried to escape by running away but then got shot and killed.
In this scene, the people who survived the shooting/bombing ran into the forest which was filled with landmines. As Loung Ung was running she saw people getting killed by the landmines, she then remembered how and where the landmines were placed.