Infantry guns were the first type of artillery used by armed forces, first in China, and later brought to Europe by the Mongol invasion. At first they were simple cast barrels called "pots de fer" in French, or "vasi" in Italian. These weapons were small, immobile, and fired large bolts or quarrels. As the barrels became longer, a way had to be found to move the guns. This led to two different solutions. One was the very light hand-gun, which became the arquebus. The other was to place the gun on wheeled carriages, such as the 2-pounder Culvern moyane, the 1-pounder Falcon, and the 3/4-pounder Falconet. These lighter Renaissance pieces led to the development of the 3-pounder and 4-pounder regimental guns of the 17th century, notably in the army of Gustavus Adolphus. The light field guns of the 17th century, known as a "drake" in England, came in almost 100 different calibres. Each had its own name, some of which were: