The next thing they remember hearing was a barrage of bullets.

[Heinrih]

Пожалуйста, помогите перевести: >>The next thing they remember hearing was a barrage of bullets.<<

Предложение стоит в следующем контексте:

The men heard footsteps above them. "We are all here", the men in the cave said themselves. "So who is outseid?"
The next thing they remember hearing was a barrage of bullets. The men took cover behind the boulders.

[Skky]

я полагаю что вас интересует barrage of bullets
имхо: обстрел, шквальный огонь, или разрывы пуль

причешите по контексту