EXAMPLES FROM THE WEB FOR ZERO HOUR
We were in assembly trenches waiting for the dread zero hour.
The bombardment grew in intensity as the zero hour approached.
It was close to the zero hour; the level of the stage was a turmoil of confusion.
Nearer and nearer the hands crept to zero hour, but they move slowly at such times.
They told me that this was "Y" day, and that zero hour when the barrage would start was at 5.20 the next morning.
The night was now well advanced so it was time to shave and get ready for zero hour.
But Milton's calm voice came across the room to them: "Zero hour," he said, stepping up into the big transmitting chamber.
Around him, he could feel a tenseness creep over his men as the zero hour approached.
Zero hour for the infantry was 5.30 o'clock on that morning of September 26th.
That was the last I saw of them, as it was within 10 minutes of zero hour, and we were not yet in battle formation.