Cross reference
Joshua 8:26
26 For Joshua did not take back his hand with the outstretched spear till the destruction of the people of Ai was complete.
Exodus 17:11-12
11 Now while Moses' hand was lifted up, Israel was the stronger: but when he let his hand go down, Amalek became the stronger.
12 But Moses' hands became tired; so they put a stone under him and he took his seat on it, Aaron and Hur supporting his hands, one on one side and one on the other; so his hands were kept up without falling till the sun went down.
Joshua 8:18
18 And the Lord said to Joshua, Let your spear be stretched out against Ai; for I will give it into your hands. So Joshua took up his spear, stretching it out in the direction of the town.