This excerpt comes from a memoir written by 1/Lt. Robert Mosley of the 89th Squadron, 3rd Bomb Group.
Our planes at the Mindoro strip were parked along the taxi way but each parking spot was surrounded by a pile of dirt, about a wing tip height, around the side and rear of the airplane. These were called revetments and the purpose of the dirt was to protect the planes as much as possible from bomb damage from the enemy and particularly from any strafing attacks. One day I was getting ready for a mission and the whole area was alive with activity as one would expect prior to a squadron going on a combat mission. Now, I must digress a little to explain briefly how the bomb release switches work in an A-20. That is, there were a number of switches you could activate so you could release the bombs in singles, pairs or pretty much whatever order the pilot wanted. There was also a salvo switch. To operate the salvo switch there was a small, maybe 2 inch long, lever like thing that you rotated from about the 6 o’clock position (it had a pin next to it on the right side, sticking out of the panel to keep you from trying to rotate it to the left) almost 360 degrees around until it hit the pin from the other side. This salvo switch was on there to allow you to drop all of your bombs at once if that is what you wanted to do but we also used it on the final pass of a mission to make sure we had dropped all of our bombs. The bomb release panel was down near the floor of the cockpit, just above where your left foot would go up under the instrument panel on to the left rudder pedal. It was not a good position for it because you had to look down near the floor to set up what ever configuration you wanted on the bomb panel, which meant momentarily taking your eyes off of where you were flying the airplane. And, it was dark down in that low spot in the cockpit, especially when being in bright sunlight and then trying to see down there in the shadows.
Well, this particular morning I had gotten in the cockpit and went through my pre-start checks but did not notice that the salvo switch was in the full salvo position. In my defense, when the lever was in the SALVO position it was no more than an eighth of an inch from the position it would have been in when in the OFF position; i.e., it was just over on the other side of a 16th inch pin. But I should have noticed it as well as the people who loaded the bombs. In fact I never quite figured out how they could have loaded the bombs with it in the salvo position but they had.
SO– when I turned on the battery switch, that plane gave a big lurch as every bomb on the plane dropped right there in the revetment. At that moment I was not sure what had happened but what I saw soon confirmed my suspicions. For what I saw was ass holes and elbows going in all directions away from me. Guys were going over the dirt walls of the revetment like the walls were not even there. My gunnery sergeant came casually around from his position in the back of the plane (as stated earlier, Sgt. Rogers was about 5 years older than me and was not impressed with Lieutenants). He looked up at me in the cockpit and said with total disgust, “What in the hell did you do?”
You would have to have been around bombs a lot to know that these iron bombs were really not all that dangerous, when not armed (these bombs had to have a little propeller on the nose of the bomb, activated by the air stream when dropped from a plane, to screw the firing pin into position to become armed) because I have seen the ground crews just drop them from the plane onto the ground beneath the plane as a expeditious way of unloading them as opposed to doing it with a winch as they should. So I was not concerned about them going off. I was just embarrassed. What was an unknown though, was what the two huge tanks of Napalm, one under each wing, would do because they dropped also. No one had ever tried dropping one of those onto a PSP surface before (and they were armed differently than the iron bombs). It can be concluded from the face that I am here to tell this story that they will not go off either.