"under the fire" is correct and usable in written English.
You can use it to mean that someone or something is in a difficult situation, often with the implication that there is criticism or pressure. For example, "The new CEO came under the fire when delivering her first speech."
Then he found a new spot nearby, under the fire escape of a theater.
Union attackers outnumbered the Confederates, but could not advance under the fire from the road and from Confederate artillery.
It would be extraordinarily difficult to continue under the fire of suicide squads trained on, and despatched from, Pakistani soil.
"Hama is under the fire for three days in this holy month of Ramadan," said an opposition leader in Damascus, the capital, who asked not to be named.
At the building in SoHo, a thin beam jutted out appealingly under the fire escape, and a "For Rent" sign seemed to promise a hassle-free installation.
Unbeknown to the gunman, Morton-Hoffman had been slipping written messages to the police under the fire door, which he now feared Monis would find.
Last December in Vienna, Christoph Koncz, a cherubic ex-concert master with the training orchestra at the Verbier Festival, in the Swiss Alps, and now, at 22, a principal second violin with the Vienna Philharmonic, recalled the Salzburg Festival debut of the Sim?ol?r Youth Orchestra under the fire-eating Gustavo Dudamel, then 27, in 2008.
We also found most areas were burned by high intensity fires under the current fire scenario, but by low to moderate fires under the historic fire scenario.
Our simulated results show that fire frequency under the current fire scenario is lower than under the historic fire scenario; total area burnt is larger with lower fire intensity under the historic fire scenario, and smaller with higher fire intensity under the current fire scenario.
Lodgepole pine declined over time under both climate change scenarios, more so under the future fire regime than under the suppressed fire regimes.
It was the fire under my ass.
