Joshua 24:11,12

I delivered them into your hand Namely, successively; for in these few words he seems to comprise all their wars, which, being fresh in their memories, he thought it needless particularly to mention. I sent the hornet before you This may signify, either that before the Israelites came into those parts, God sent hornets, which so infested the inhabitants, that many of them were compelled to leave their country; or that, when they were actually engaged in battle with their enemies, these dreadful swarms, which first appeared in their war with Sihon and Og, tormented the Canaanites with their stings, and terrified them with their noise, so that they became an easy prey to Israel. God had promised to do this for them, Exodus 23:27; and here Joshua reminds them of the fulfilment of the promise.