I'm working on a short story. In in this story there are elves. I'm hoping to realistically write how they would fight both one another and other races.
NOTE: The elves didn't naturally evolve, they were created involuntarily.
Elves stand roughly 4 feet tall, give or take a few inches per individual.
Elves have 5 inch pointed ears capable of movement. They can move their ears back against their skull and can move them up or down 80 degrees. This allows them to (ideally) hear much better, and they assist in communication. Elven ears are also the widest part of their body. Elves have remarkably strong hearing, and can hear from 20 Hz to 50,000 Hz
Elves have thin frames prioritized for moving quickly, and long nails to help grip trees.
Elves reproduce a little faster than humans, taking 7 months instead of 9 for a pregnancy.
While the elves live in a variety of places, in the story they'll be found in a specific forest. The trees here are 150-200 feet tall, very thick, and packed so densely that in uncleared areas the gap can be as little as half a foot. Temperatures range from 20 Celsius in the summer to 0 in the winter.
The elves usually have access to stone age weapons, but this is due to their nomadic nature. They settle down sometimes for a few days if they feel the area is safe, during which they forge metal weapons and equipment, as well as jewelry for trading among themselves and others.
Other races in this world
Humans patrol the edges of the forest on several day trips, mostly to ensure that nobody is building up supplies or an army. They have 15th-16th century technologies. I imagine they'd avoid firearms or cavalry due to the environment though.
'Orcs' (name is planned to be changed soon) are large, purple, and in constant mental agony (like a burning headache) leading to anger outbursts. They can forge basic tools and weapons and live in small scale wooden camps in clearings. I plan to ask a similar question about them as well- I'll include the link when I do.