Joshua drew not his hand back That is, he continued the battle, and ceased not to fight, spear in hand, till he had utterly routed them. Or, as some think, it means that he kept his hand and spear in the same posture, both stretched out, and lifted up, as a sign to encourage and direct his army to go on with their work till the enemy were destroyed.
Related Commentaries of Joshua 8:26
Joshua 8:26
26 For Joshua drew not his hand back, wherewith he stretched out the spear, until he had utterly destroyed all the inhabitants of Ai.