The inferior soldier knows that he is likely to die, but he will endure in the war and fight anyway. His knowledge of fact is that he is likely to die; his knowledge of value is that he can increase his odds of survival with endurance in fighting. The superior soldier knows that he is likely to win and will endure because of this likelihood. His knowledge of fact supersedes any need for knowledge of value. Despite this discrepancy, both soldiers show endurance. But the discrepancy itself disproves the counterexample because the variable does not allow for a consistent comparison. Whether or not the inferior soldier is foolish or wise would determine the validity of the two soldiers counterexample.

My counterexample of the battered wife demonstrates an argumentative failure based on the knowledge of fact and the knowledge of value. The battered wife who stays with the abusive husband is showing endurance, not based on knowledge of fact, but despite knowledge of fact. She knows that she is likely to die if she does not leave her violent husband (knowledge of fact). Yet she endures the relationship and endures...

This does not show any knowledge of value and defies reason based on knowledge of fact, thereby showing a flaw in my counterexample based on the following argument: A. Wise endurance is courage. B. Endurance in spite of a detrimental knowledge of fact is not wise. C. Therefore endurance that is not wise neither proves nor disproves D3.
Professor Lewis is correct about the counterexample involving the two soldiers. The inferior soldier is wise and not foolish, thereby negating this argument as a counterexample.

In order to change this argument so it becomes a valid counterexample of Laches definition of courage, the story would have to be modified. A successfully altered version of this counterexample would remove all knowledge of fact and value, thereby forcing the two soldiers to choose endurance over retreat based on its own merit. If the two soldiers chose to endure, even in the face of possible death with no knowledge of value to base their decision on, this would satisfy the criteria for D3. The soldiers' choices in this situation would either display or disprove Laches' D3 of courage.