Ammunition started cookifig off, tracer rounds going up like fireworks.

They fired four warning shots, tracer rounds, just to make sure there was no misunderstanding.

I'm used to getting shot at now, having tracer rounds hit off my truck.

I heard reports of tracer rounds being fired as we moved forward.

Lines of tracer rounds overlapped in the deep green twilight.

Both men ducked as green tracer rounds streaked up at them.

A very few tracer rounds moved the opposite way.

Normally one tracer round was added every four or five rounds to aid laying.

And we're only seeing about one every twelve tracer rounds .