Very good contribution here. Enjoyed the article. I used to devour anything on intelligence and radio and cryptography when I was in high school. Two items come to mind along that line. Britain had some spies in Paris. One of them was taking the subway. He looked up the stairway he was climbing and an elderly lady with one crutch was slowly making her way up ahead of him. Suddenly a group of German Officers came running down the steps. Suddenly her crutch slipped and an officer went tumbling down the steps. She muttered something under her breath and the Brit heard her. She said "third one today".
The second one is amusing too. The Brits commandeered every private boat they could get their hands on and would serve their need. One of these was a fair size private yacht that they fitted out with a couple of guns with the idea of using it as a patrol boat in the English channel. It was really foggy one night and the converted yacht commander realized through the wisps of fog that they were between two larger German war ships. So he alerted the crew, manned the guns and went like a speed boat between the ships firing at both as they raced through. I guess the German ships did a heck of a lot of damage to each other before reality set in.
oops....just thought of another. A U.S. submarine was patrolling merchant Japanese shipping lanes and harbors they used. The sub slipped into a harbor and let go a couple torpedoes at a ship. They just missed the ship but torpedoes continued on and
slithered up the sloping beach and destroyed a passing munitions train. I guess it raised some eyebrows when they read the battle report. So many tons of munitions destroyed and a steam train by a submarine.
When the North Atlantic convoys were first protected by U.S. destroyers before war was officially declared. A destroyer sent a note back to it's home port. It was catchy and made the rounds of many ports. The message radioed was "sighted sub, sank same". A few months later a merchant ship sent a message..."sighted sub,...glub, glub " and was never heard from again.