What role did the hornet play in the conquest of Cana'an?
Rashi: It shot poison, which both castrated them and blinded the Cana'anim that remained, wherever they were hiding. 1
QUESTIONS ON RASHI
Rashi writes that the hornet shot poison at the Kena'anim, which castrated and blinded them. Sotah 36a says that it did not cross the Yarden (lest it harm Yisrael
Sotah 36a: It stood on the [east] bank of the Yarden and shot poison at them.
Ramban (in Mishpatim): The where two lots of hornets. Refer to 7:20:1:1*.