Sonderkommando
However, before this plan was ready, people in the camp's resistance movement found out that the Nazi guards were going to murder the Sonderkommando on 7 October 1944.  The resistance members warned the Sonderkommando, who attacked the guards with two machine guns, axes, knives and grenades.  They killed about 3 guards and hurt about 12 others.  A total of 451 Sonderkommandos were killed on this day.  Some died fighting the camp's guards.  Some did not, and were executed later that day by the Nazis.