He picked them out, remembering how he had stared at them every day for a week, trying to pick up the Vichy gunflashes but seeing nothing but the bare heat-shimmering hills; remembering how in the night you could see the gunflashes ...
Source: wiktionary
Then the German guns suddenly went off with one or two gunflashes faintly visible to the side of the smoke-screen. The Russians got ready to answer. Somewhere high up, a German shell whined, harmlessly, like a mosquito.
Source: wiktionary
"Williams thinks it's important. I've been watching those gunflashes out there. They've all been to the east or southeast. We've been thinking the war was out there...but I saw single gunflashes...four of them...about south southwest, just before daylight."
Source: wiktionary