Exodus 17:8-11 - Now Amalek came and fought with Israel in Rephidim. And Moses said to Joshua, “Choose us some men and go out, fight with Amalek. Tomorrow I will stand on the top of the hill”

When Abram heard that his relative had been taken captive, he called out the three hundred and eighteen trained men born in his household and went in pursuit as far as Dan.

Genesis 18:17-18 - And the Lord said, “Shall I hide from Abraham what I am doing, since Abraham shall surely become a great and mighty nation, and all the nations of the earth shall be blessed in him?