Random fact: the Allied Airforce dropped over 1700 tons of bombs over the Normandy beaches on D-Day...but due to low cloud covering the area, not one hit the target. No German soldier was even scratched, but they may have been worried when they saw Allied rocket ships approaching the beach. They needn't have been. Not one reached the shore, dropping short into the surf. Most of their heavy weapons and armour sank in the Channel and some units landed far from their intended combat zone: American casualties in the first wave were 50%, and in one sector reached 92%...when you analyse the events leading up to D-Day it's hard to see how they got off that beach at all. Mostly, it's down to the counter-measures of Paratroopers landing behind the lines and disrupting German response to the Invasion and the counter-intelligence activities of agents in the build-up.
One of these was a woman who became a double-agent, sending false reports back to her handler in Berlin. She was brought over long before the events of that day unfolded and had to leave her pet dog behind in Gibraltar due to strict quarantine laws. She whined about it for months on end until the sad news broke that the animal had met an unfortunate end under the wheels of an army truck. Not happy about this at all she considered revealing her deception to the German Abwher. Fortunately, she did not do so, but all she had to do was slip an extra dash into the line of code and all would've been revealed. If she had done so, it's quite possible the landings would've been a failure. Was the driver following orders? We'll never know for sure because those records are still not declassified but for the sacrifice of a small dog, the world could've been a very different place in 1945.