1. Colt 1911: This .45 caliber semi-automatic pistol was the standard issue sidearm for the United States military. It was known for its reliability and stopping power.
2. Webley Revolver: This .455 caliber revolver was the standard issue sidearm for the British military. It was a solid, well-made revolver with a long service life.
3. Luger P08: This 9mm caliber semi-automatic pistol was the standard issue sidearm for the German military. It was a high-quality pistol known for its accuracy and reliability.
4. Mauser C96: This 7.63x25mm caliber semi-automatic pistol was used by various countries, including Germany, Russia, and China. It was a unique pistol known for its high rate of fire and large magazine capacity.
5. Browning Hi-Power: This 9mm caliber semi-automatic pistol was not officially adopted by any military during World War 1 but was used by some countries, including Belgium and France. It is considered one of the most influential pistol designs in history.
6. Frommer Stop: This 7.65x21mm caliber semi-automatic pistol was used by the Austro-Hungarian military. It was a compact and reliable pistol, but it was not widely adopted outside of Austria-Hungary.