A more thorough explanation:

An unavoidable casualty is an event that cannot be prevented because it is caused by an irresistible physical force that cannot be foreseen or prevented by human skill or reasonable foresight. This type of event is also known as an unavoidable accident or pure accident.

Examples of unavoidable casualties include accidents resulting from natural disasters such as lightning, storms, earthquakes, or sudden illness or death. These events are beyond human control and cannot be prevented by taking reasonable precautions.

For instance, if a driver is involved in a car accident due to a sudden storm that caused the road to become slippery, it would be considered an unavoidable casualty. The driver could not have foreseen the storm or prevented the accident by taking reasonable precautions.

Similarly, if a person is injured due to a sudden illness or medical emergency, it would be considered an unavoidable casualty. The person could not have prevented the illness or emergency by taking reasonable precautions.

In summary, an unavoidable casualty is an event that cannot be prevented due to an irresistible physical force that cannot be foreseen or prevented by human skill or reasonable foresight.