chemical warfare
chemical operations

This is used for protection against nuclear, biological and chemical warfare.

Would they use their appalling superiority in biological and chemical warfare?

They have also asked the Government to demand serious international sanctions against countries that wage chemical warfare.

This appears to be the earliest archaeologically-known instance of what we would now call 'chemical warfare'.

If non-living things (like toxins) are used, this is considered to be chemical warfare.

The possibility of torture or chemical warfare worried him.

But, we will not call it chemical warfare.

Television has been flooded with the terrifying talk of biological and chemical warfare.

It is a long time since what my mother used to call "chemical warfare" in the garden became unacceptable.

There is also a short history of American involvement with biological and chemical warfare.