Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Fiat-Ansaldo M13/40 was an Italian medium tank ("M" for Medio (medium) according to the Italian tank weight standards at the time: 13 tonnes was the scheduled weight and 1940 the initial year of production), designed to replace the Fiat L3, the Fiat L6/40 and the Fiat M11/39 in the Italian Army at the start of World War II.