Joshua 7:3-5

3Then they returned to Joshua and said to him, “Do not make all the people go up [to fight]; have only about two thousand or three thousand men go up and attack Ai; do not make the entire army go up there, for they [of Ai] are few.”

4So about three thousand men from the sons of Israel went up there, but they fled [in retreat] from the men of Ai.

5The men of Ai killed about thirty-six of Israel’s men, and chased them from the gate as far as [the bluffs of] Shebarim and struck them down as they descended [the steep pass], so the hearts of the people melted [in despair and began to doubt God’s promise] and became like water (disheartened).