'Commander' in the Bible

Bring also these ten cuts of cheese to the commander of their thousand, and look into the welfare of your brothers, and bring back news of them.

Now when Saul saw David going out against the Philistine, he said to Abner the commander of the army, “Abner, whose son is this young man?” And Abner said, “By your life, O king, I do not know.”

Therefore Saul removed him from his presence and appointed him as his commander of a thousand; and he went out and came in before the people.

David then arose and came to the place where Saul had camped. And David saw the place where Saul lay, and Abner the son of Ner, the commander of his army; and Saul was lying in the circle of the camp, and the people were camped around him.