Essentially, a people must believe in the causes for going to war. To go to war without the proper moral backing (or, I should say, proper in the context of the society. i.e Society A may need religious justification for war, while Society B may need Humanitarian justification) runs the chance of your cause loosing steam midway through.
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If you need to imitate a sound in your writing, onomatopoeia’s got you covered. It means the use of words such as “buzz” or “murmur” to mimic the sounds associated with the things or actions they describe.