In my own opinion if he felt it was a justifiable ruse, and assuming his CO agreed, then his interpretation of the "laws" of the battlefield were correct. Arguing about them later won't change the opinions of that time and place, and we can't presume to judge. The point about laws, whether it be war or not, is that they apply no matter what an individual makes of them. German officers got the order to shoot political commissars, they passed the order on to their soldiers and everybody was assured by their superiors that it is justified and correct - and many certainly thought it really was. But just because they were told and thought it was correct doesn't make it so, does it? Would you not argue about the commissar order just because back then they were convinced it was right?