Bombing missions during this period were not as simple as imagined. They had no navigation, no radar, and not even radio.
Pilots could only rely on a map, a compass, and a ruler.
Therefore, even if they knew the exact position of the target or could see it visually, it was still difficult to bomb accurately.
The bomber formations might drift off target during flight, initially by a very small angle. After flying dozens or even hundreds of kilometers, this small angle could result in a deviation of ten or even dozens of kilometers.
Hidden targets, such as artillery positions carefully concealed in the woods and camouflaged by the German Army, were almost impossible for bombers to locate and destroy.
This was one of the reasons why bombers were questioned and criticized by the so-called "military commentators" of France:
"Bombers can probably only attack visible and obvious targets like buildings and bridges."
