The Panzer II was around 50% heavier than the Panzer I. It had a 20 mm Solothurn antitank gun as main armament, as well as improved armour of up to 30 mm. Also sent to Spain from 1937, the Panzer II proved more capable against light infantry, but no better when faced with capable anti-tank guns or other tanks. Despite these weaknesses, production continued until 1941. At the outbreak of war, the German Army had 955 PzKpfw IIs and almost 4,000 were built in total.