I hadn’t heard of Chenogne, but I did know one World War II vet who told me that they did not take SS prisoners and did not accept the surrender of German snipers who ran out of ammunition. Surrendering with a full clip was a German soldier’s best life insurance policy.
A Ramagen, after the American crossing of the Rhine, a group of German civilians were hiding in a railroad tunnel. They realized that they were in a tunnel with a bunch railcars containing flammable materials. They decided to surrender to the Americans, and a German railroad worker left the tunnel waving a white flag. The Americans shot him. After they managed to surrender, they asked the Americans why they shot him. The Americans thought he was SS because the railroad uniforms were black, like the SS.
In the final order for Unternehmen Wacht am Rein, Hitler more or less ordered the Wehrmacht not to take prisoners. He wanted the Americans to retaliate by killing German prisoners. Many, if not most, German soldiers realized that the War was lost and they would fair far better surrendering to the Americans than the Russians, and had a better chance of surviving the War in American custody than fighting in the Wehrmacht. Hitler wanted to change this perception. Killing German prisoners served Hitler’s ends. The Germans most inclined to surrender were the least ideological and least inclined to kill American prisoners.