When do Vladek and Anja realise that war is coming?

When they return home, Vladek's father-in-law tells them that their factory was robbed while they were away. Everything was taken, though Vladek does not think that there were any anti-Semitic motives. Within a few months, though, they set up another factory, and soon things are again going well. They have a two-bedroom apartment and a Polish nurse. But anti-Semitic riots are brewing, and the situation is beginning to look ominous. The Nazis are stirring anti-Semitic sentiments amongst the Poles. Anja comments that, "when it comes to the Jews, the Poles don't need much stirring up."