"increasing casualties" is correct and usable in written English
This phrase can be used when referring to increases in casualties or losses due to some event or situation. For example, "The war had been raging for weeks resulting in increasing casualties on both sides."
So far they have succeeded only in increasing casualties.
Many Americans may recall the increasing casualties from these homemade devices.
The frequency of the bombardment has inevitably resulted in increasing casualties.
Instability in wide swaths of the country, increasing casualties and recent terrorist attacks have intensified these calls.
Later, however, increasing casualties among Israeli forces designated for the settlements' defense forced Sharon to revise his opinion.
There seems to be a worryingly large potential that planning in the past has been responsible for increasing casualties from terrorist activity," he says.
The increasing casualty rates hit his squadron hard - two or three pilots would disappear every day.
The disputed reports were symptomatic both of an increasing casualty rate among Afghan forces and growing government sensitivity about such information.
It was nearly seven years before the UK's dead in Afghanistan numbered 100 but the past two years have seen an increasing casualty rate.
In addition, drone warfare seems to be creating a sinister system of embedded economic incentives that may lead to increasing casualty figures on the ground.
Increasing casualty numbers in the New Guinea campaign meant that the hospitals in Queensland would quickly become unable to deal with the quantity of the casualties and the nature of their injuries, so a longer voyage to Sydney was required.
