While the friendly approach is used with prisoners of war in this episode, the most effective means used by the British was to combine the civilized approach with quite a few hidden microphones. By keeping the stress down. the prisoners were more likely to discuss things between themselves, which resulted in the gathering of a great deal of useful intelligence.
The title alludes to Churchill's June 4, 1940 speech, which included the words, "...we shall defend our Island, whatever the cost may be, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills; we shall never surrender..."
One of the German aircrew is recovered unconscious hanging from a tree by his parachute risers. Mysteriously his holster is empty. It was not unheard of for American air crew to dispose of their side-arm during their decent with the intentions of avoiding, stupid mistakes (shooting ones life raft or self), misunderstandings (capturing soldiers, upon seeing your weapon, may feel threatened and shoot you), inciting civilians to violence (who already see you as evil).
First of very few episodes not written by show's creator Horowitz.