The Czech army was mainly equipped with Skoda designed artillery, with many designs dating back to World War One. These vintage weapons served alongside the more modern designs which were developed in the 1930s. In 1938 anti-tank units were equipped with 37mm guns and the anti-aircraft units 20mm and 80mm guns but some still had older 83.5mm guns. The field artillery was equipped 80mm guns and 100mm howitzers. Mountain units were served with 75mm mountain guns and 100mm mountain howitzers. Larger pieces included the 105mm and 150mm guns and 150mm howitzers.