Final answer:
The provided information does not specify Wiesel's actions during Rosh Hashanah services but instead describes various aspects of resistance and the circumstances during the Holocaust.
Step-by-step explanation:
The original question, "When thousands attended Rosh Hashanah service in the camp, what did Wiesel do?", seems to be asking for a specific action by Elie Wiesel, the author of 'Night,' in response to a Rosh Hashanah service event during the Holocaust. However, the provided information does not directly address Elie Wiesel's actions at Rosh Hashanah services. Instead, the information discusses resistance efforts during the Holocaust, including the Warsaw ghetto uprising, Irena Sendler's courageous acts of securing safety for Jewish children, and other figures who defied Nazi atrocities, such as Oskar Schindler and Raoul Wallenberg, as well as describing the horrific conditions and acts of genocide committed in the ghettos and camps.
Rosh Hashanah services would have been significant to the Jewish prisoners as a time of reflection and keeping faith despite the dire circumstances. However, without specific details on Wiesel's activities during these services, we can only assume that the provided information aims to illustrate the broader context of Jewish experiences and resistance during the Holocaust rather than his personal actions. If the question intends to gather insights from Wiesel's book 'Night,' we would have to refer to that text to provide an accurate answer.