1. Horses

Used for transportation and cavalry charges since ancient times, like in Napoleon's army.

2. Elephants

Ancient Indians and Egyptians employed elephants as war machines with howdahs carrying soldiers or projectiles.

3. Pigeons

Carried messages between troops during World War I & II using Morse code on their legs or wings.

4. Dogs

Served various roles such as mine detection, messenger relay, search-and-rescue during wars throughout history.

5. Dolphins

Soviet Union trained dolphins to pull underwater mines attached to ropes during the Cold War era."

6. Monkeys

Trained by Japanese forces in WWII for carrying grenades strapped around their midsection near enemy lines, known as 'monkey bombs'.