7 During the final months of WWII, Japan planned to use plague as a biological weapon against the U.S. civilians in San Diego, California, hoping that it would spread terror and stop American from attacking. But Japan surrendered 5 weeks before the plan saw fruition. 

The Imperial Japanese Army conducted germ warfare and several human experiments, killing over 580,000, and reportedly successfully used bubonic plague, cholera, anthrax and other disease to kill as many as 400,000 Chinese. Several other kinds of human experiments were also conducted on prisoners. They were taken outside in freezing weather, with arms exposed and dipped in water until frozen solid when the doctors would amputate them. The process was repeated again with the remaining limbs, until only the head and torso were left. The prisoners were then used for plague and pathogen experiments. The biological warfare on the U.S. was part of Operation Cherry Blossoms at Night and was supposed to take place on 22 September, 1945.(source)

8 Nazis rigged skewed hanging pictures with explosives in buildings that would be prime candidates for Allies to set up a command post from. When Allied officers did set up a command post there, they tended to straighten the pictures, triggering the bombs. 

The Germans made it a point and excelled at predicting their enemy’s behavior and thought process enough to set successful traps for them. One of them was to put the picture frames in the room askew rigged with explosives. So when a fussy Allied Officer entered the room, he would want to straighten the picture triggering the bomb. Other such traps were placing things in on the roadway, like a log, barrel or a vehicle, that the enemy would want to move and trigger the bomb in doing so.(source)

9 During WWII, the Allies used the prices of oranges in Paris to indicate whether the railroad bridges were bombed successfully or not.

In 1944, the Allies systematically bombed and sabotaged railway lines and destroyed railway bridges of German occupied Paris to thwart the Germans. The open-source intelligence component of CIA, Foreign Broadcast Information Service, would access openly available information in news and media from various locations to collect intelligence. One such example was the prices of oranges in Paris during these systematic bombings.

The Allies were able to cut supplies to the city, though they also managed to make a lot of collateral damage in the form of heavy death toll on civilian lives and severe shortages of food and other essential supplies. The food, clothing and other items were highly rationed forcing civilians to rely on farmers’ black market for food, which was very expensive. Many of them had moved to rural parts of France where there were less Germans and food was easily available.(1, 2)

10 A Japanese Officer during WW2, killed himself rather than order 2000 Taiwanese soldiers under his command to conduct a kamikaze attack. 

Otoemon Hiroeda was a Japanese police officer who was posted in Japanese-era Taiwan during the war and ordered to assume command of a naval patrol squadron consisting of 2000 Taiwanese soldiers. They were transported Philippines and were surrounded, in February, 1945, by the US Army which reached the outskirts of Manila. Hiroeda was ordered to supply the Taiwanese soldiers for suicide attacks on enemy tanks, but he refused. Instead, along with his Taiwanese sergeant he entered secret negotiations with the US forces and ordered the soldiers to surrender saying “You are Taiwanese and no doubt have wives, parents, and siblings waiting for you at home…you men at least should return home alive.” He then committed suicide by shooting himself.(source)

11 During the war, German soldiers fought alongside the American soldiers and French prisoners to defend an Austrian castle against an SS division. 

A few days after Hitler committed suicide, a US Armored Division liberated an Austrian castle called Schloss Itter in the Tyrol, which housed many high level French people including ex-prime minsters and some commanders-in-chief. But, later they were attacked by 17th Waffen-SS Panzer Grenadier Division (SS or the Schutzstaffe, was a major paramilitary organization under Hitler and the National Socialist German Workers’ Party) and were met with resistance in large numbers in the form of anti-Nazi German soldiers along with the prisoners.(source)

12 A Russian all-female bomber unit, called the Night Witches, flew biplanes against the Germans in WWII. The regiment was of 40 2-membered crews and the regiment flew over 24,000 missions and dropped 23,000 tons of bombs. 

The regiment flew harassment bombing and precision bombing missions against the German forces from 1942 till the end of the Second World War. The biplanes they used were wood-and-canvas Polikarpov Po-2, which were only used for training purposes and for crop dusting. So they could only carry six bombs without any parachutes.

To compensate for the obsolete and slow biplanes, the pilots had to employ very skilled maneuvering techniques to evade the German pilots, who found them very difficult to shoot down. The night bombers used an attack technique in which they would idle the engines and glide towards the target to drop the bomb. Since the only sound from the planes is that of the wind, which the German Soldiers likened to broomsticks, they were called the Night Witches.(source)