Panzer I
In 1934, delays in the design and production of the Panzer III and Panzer IV medium tanks were becoming apparent. The Panzer I had no weapons capable of defeating armor and thus no chance of success against enemy tanks. Designs for a stopgap tank were solicited from Krupp, MAN, Henschel, and Daimler-Benz. Design work on the Panzer II began on 27 January 1934. The first experimental model was ready in February 1935. The final design was based on the Panzer I, but larger, and with a turret mounting a 20 mm anti-tank gun. Production began in 1935, but it took another eighteen months for the first combat-ready tank to be delivered.