: What to avoid when writing a war scenario? For example my story is placed in WW3, well the second chapter is placed in WW3, and yet I struggle, to write a plausible WW3 scenario. I have

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Possibly, You Are Struggling With the Scope
It sounds as if you are struggling with the scope of writing about a huge war.
I'm thinking your question might be better as something like:
How do I deal with writing on a grand scale event such as an entire war?
Find the Proper Point of View (POV)
The answer is that because a war is so large, you cannot write about all of it. It would take a parchment the size of the sky.
However, if you focus on a specific POV within the grand scale the story will most likely become much better anyways, because:

it will focus on one person's experience
The reader will live the story vicariously through that character
Sympathetic and emotional moments will come through the character and absorb the reader more completely than an overview narrative that just tells about events happening.

Focus On Character & Scene Within the Larger Story (War)
If you will focus on one character and one scene you will find it much easier to write.
Individual Scenes Add Up to Story (The War)
Finally, your individual scenes with transitional narratives will sew it all together and the reader will experience it as one war.
Small Example
Scene: Pvt Jones stationed at front leads charge into robot caves.
Scene: Corporal Samson calls in airstrike from field command HQ
Scene: Combat unit disembarks water crawlers at beach. Many are killed and Officer Smith is shellshocked but goes berserk leading her people to take the west caves.
Write Each Scene With Detailed Precision

Jones pushed a button on her communicator, "There are only three of
us, but we're moving into southwest cave."
As Jones stepped into the
cave, she heard something to her left, then saw the robot's red
glowing eyes. She dropped to her knee, brought up her 44 caliber
pistol and fired. The robot's head exploded.
"Don't sneak up on
me," Jones said. "I don't like sneaky robots."

Write the next scene.
These will all add up to the entire story and war for your readers.
Readers are smart and add it all up for us.
What we (authors) don't write, the reader's imagination writes for us. :)
Their brains fill in the blanks.

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