The very name "tank", a code name to deceive spies, was used to cover the first experiments at the Scottish Lincoln William Foster & Cie. In fact, factory workers were told that they were assembling "mobile water tanks" for operations in Mesopotamia. Later, they were shipped in large wooden crates to maintain secrecy, with sometimes "With Care to Petrograd" and a fake destination in Russia. - See more at: http://www.tanks-encyclopedia.com/ww1/gb/british_wwI_tanks.php#sthash.5ms354HJ.dpuf
