Identify the characteristic of the nature of war that most requires flexibility of thought

Identify the characteristic of the nature of war that most requires flexibility of thought. Because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions

I believe the answer would be Fluidity

Explanation:

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.