The "alert line" and the "warning line" were all at smaller distances that prescribed practice; the "stop line" was absent altogether. All these were approximately known to the soldiers, but there was no sign for incoming vehicles. In particular, the Alert line was just 120 m from the first military vehicle, instead of the prescribed 200–400 m. This, combined with the lack of signalling, would have forced the gunners to be alert and not get distracted for a single second throughout the 80-minute-long mission.