"during warfare" is correct and usable in written English.
You can use it to indicate a time period in which conflict is taking place. For example: "The situation in the city grew more dangerous during warfare."
Rape is a terrifyingly common weapon used to terrorise and control communities during warfare.
There the Toraja built their villages on easily defended hilltops for better security during warfare.
This resolution is a reminder that if you target health workers and hospitals during warfare, you are a war criminal, plain and simple".
After childbirth a lengthy period of time must often elapse before coitus can resume, and some peoples abstain for magical reasons before or during warfare, hunting expeditions, and certain other important events or ceremonies.
Much of the port was destroyed during warfare in the 1980s and early '90s; however, the port continued to function, and in the early 21st century it was a key source of income for the Republic of Somaliland.
In a rare public rebuke of one side during warfare, the International Committee of the Red Cross today branded the Israeli Army's behavior "totally unacceptable" for attacking its vehicles and buildings.
English settlers suffered severe losses at the hands of the French during the warfare that lasted from 1689 to 1713.
During the Suez Crisis in 1967, almost all the population was evacuated, and most of the settlements were severely damaged or destroyed during subsequent warfare.
Once upon a time, the quaint bend in this serpentine alley (previously known, unsubtly, as the Blood Angle) abetted all manner of ambushes and skullduggery during gang warfare.
Other towns in the locality were repeatedly burned during border warfare between the Scots and English, and the abbeys of Jedburgh, Kelso, and Melrose were ruined in 1544 45.
He would have happily remained a commando until the mandatory retirement age of 40 if not for a virus contracted during jungle warfare training in Guyana in 1995.
