PREVIEW
... didn't want his troops to be discovered by the enemy, nor did he want the direction and even the route of the march to be constantly under enemy surveillance.
More importantly, he didn't want his troops to be strafed or bombed by enemy aircraft.
On rainy days, the direct casualties caused by enemy bombing and strafing aren't significant, but it affects the speed and morale of the troops.
Once the air superiority is regained, all these troubles will be eliminated.
...
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