Write down important thing to be remembered

Exodus 17:8-16
Amalekites was first among the nations(Number 24:20)
The Amalekites defeated by Israel.
Amalekites came and attacked the Israeltie at Rephidim.
Moses said to Joshua,"Choose some of our men and go out to fight the Amalekites. Tomorrow I will stand on top of the hil with the staff of God in my hand.
As long as Moses help up his hands, the Israelite were winning, but when even ever he lowered his hands, the Amalekites were winning. Aaron and Hur help his hand up- one on one side, one on the other, so that his hands remained steady till sunset. So Joshua overcame the Amalekite army with this sword.
The Load said to Moses"Write this on the scroll as something to be remembered and make sure that Joshua hears it, because I will completely blot out the memory of Amalek from under heaven."
Why?
It wasn't Israel attacked Amalekite, but Amalekite attacked Israelites, so God will completely bolt out the memory of Amalek from the heaven.
Choose some of our men- are Israelite and following the command of God
Moses hand up his hands, means God help them to fight. So fight winning is depend on the Load, not depends on the men or horses.
Moses standed on the hill, then he may pray for the whole situation of the fighting.
It is said in Jews that Hur is husband of Miriam, he was a leader in Israelite.
We need to write down important thing for memorized, or we will forget the important thing and God's command.
How?
Fight winning depends on the Load, He control everything, when we rely on Him, following His decrees and laws, He is with us.
We do not attack others or build enemy, but we need to defeat enemy for us.