When Pvt. Havers is in the jail cell talking to Sergeant Diepel at one point his right hand changes orientation from one shot to another. In one shot, he is holding a bar; in the next immediate shot, his hand is off the bar; in the next shot, his arm is sticking out of the cell window.
The lookouts at the Fort are maintaining a constant vigil so they should have seen the two burning crosses being lit as well as the bodies of the dying and wounded legionnaires being placed near the cross especially since it was broad daylight.