How to Write Fictional Wars
1. Cause
A war can't happen just BECAUSE—all wars happen for at least one, usually a multitude of, reasons. The main question to ask is:
What is something both sides are willing to die/kill for? Or at least that their leaders deem important enough to endanger civilian lives for?
NOTE: That final question may not apply as much if you're writing types of leaders who don't care about preserving human life aside from their own, and other nuances like that. But even so, your immoral leader might still be smart enough to realize the importance of population as an economic base and general resource, so it's still a relevant question.
Here are some ideas for causes:
POLITICAL:
succession and dynastic disputes
gaining/losing foreign influence that is important to some political entity
gaining popular support
strength propaganda
liberation from an established order
personal rivalries between leaders that spiral
ECONOMIC:
gaining/protecting prized resource (e.g. oil), trade routes, valuable land (like large fertile areas)
conquering to plunder
RELIGIOUS/IDEOLOGICAL:
holy wars, crusades/jihad
liberation from an ideologically opposing order
fighting for "what's right"
rebelling against tyranny
ACCIDENTAL:
diplomatic misunderstandings (e.g. unreceived letters, catastrophic misspellings, language barriers, misread body language, etc.)
assassinations
basically, any small-scale event that escalated past the point of no return
Keeping a timeline of important events in your world will help greatly with creating a realistic, cohesive background for your war.
2. Who's fighting?
These are ideally the ones most deeply involved in the causes you chose. Here are some ideas for your belligerents:
Nations: Nation-states. Countries. Empires. Any large, sovereign territory with its own borders and armies.
Factions, tribes, clans: More decentralized, tend to be smaller-scale (although stories about these factions manipulating more powerful entities are interesting), feuds may be more personal (e.g. vendettas)
Non-state actors: Insurgents, guerillas, terrorist organizations—these groups tend to engage in asymmetrical warfare where they get edges on official, government fighters through ambushes, infiltration, and destabilizing the region
Alliances: Powers not inherently involved may be dragged into big wars out of loyalty or coercion. In real life, this has caused many smaller conflicts to eventually expand
For each group, map out their strengths, weaknesses, technology, culture, fighting styles, fighters, and supporters/opponents.
3. Battles, Tactics, and Strategy
Generally, the grand strategy is the plan to achieve the overall goal (e.g. winning, retaking X, gaining Y, driving back Z), whereas tactics are acts within the strategy to achieve it.
Pick and choose which battles to write—these tend to be the most important ones, either to your characters, or to the belligerents (e.g. the battle that tipped the scales for one side, the pyrrhic victory, the final defeat, the brutal stalemate).
Here are some writing ideas:
espionage networks
assassinating important targets
besieging a key city
ambushes, guerilla warfare
naval blockades
cutting off or establishing supply lines
long campaigns across a region
conventional battles with 2+ parties on the battlefield, arranged troops, traditional formations and tactics (e.g. horses charge into ranged troops)
sending reinforcements to help during a battle
4. Wider Impact
During or after the war, many things will change for all parties involved, not just the population count or supply availability.
Politically:
Has the dominant ideology shifted?
How many more refugees, orphans, and destitute people are there? What have some of them resorted to doing for a livelihood?
What new technologies have been developed, and how have they been integrated into society?
Are there new borders?
Has a once-powerful nation fallen, or maintained its place? Has a new nation risen?
What was the price of 'winning'? For the other side, what did it cost to lose?
Individually:
Soldiers: How exhausting was it? Were there new experiences of camaraderie? Did some feel more courageous than others, and did they find more glory or devastation from warfare? What is the trauma like?
Civilians: Did they live every day in fear, and did a point of numbness arrive? Was there any resistance? Were any displaced, starved, tortured, or bound into servitude? How did they adjust to this new life?
Leaders: How did they make decisions—were they more calculating, emotional, magnanimous, petty, cruel, etc.? What sort of political pressure did they face? What moral compromises did they make? Did they even care about the individuals they sacrificed for the cause? How did they justify it?
NOTE: This is an oversimplification of the demographics you could focus on (e.g. different levels of leaders and soldiers, different occupations of civilians, different faction members within each group definitely faced different struggles), but a good starting point.
OVERALL:
READ, READ, READ! There are many real life and fictional wars that demonstrate these points perfectly, and you can learn a lot about writing warfare through studying it. Some significant and fundamental ones to learn about include:
Peloponnesian War
WWI, WWII
Crusades (particularly the First for simplicity's sake)
Punic and Gallic Wars
Mongol Invasion of Europe
the history of the Middle East, basically the entire thing
American Revolutionary War
NOTE: This list is quite Western with few exceptions. I'm not too familiar with the details of wars in other continents, and I have not personally studied them enough. My field of expertise is Classics and largely European politics. I 100% encourage further exploration in other directions.
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instagram: @ grace_should_write
Hope this was helpful, and let me know if you have any questions by commenting, re-blogging, or DMing me on IG. Any and all engagement is appreciated :)
Happy writing, and have a great day!
- grace <3


















