Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Special Operations Executive:

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

SOE also revived some medieval devices, such as the caltrop, which could be used to burst the tyres of vehicles or injure foot soldiers[1] and crossbows powered by multiple rubber bands to shoot incendiary bolts. There were two types, known as "Big Joe" and "Li'l Joe" respectively. They had tubular alloy skeleton stocks and were designed to be collapsible for ease of concealment.[citation needed]