Howitzer groups called batteries. The English word ""howitzer"" comes from the Czech word ""houfnice"", from "houf", "crowd", and "houf" is in turn a borrowing from the Middle High German word "Hūfe" or "Houfe" (modern German "Haufen"), meaning "heap". "Haufen", sometimes in the compound "Gewalthaufen", also designated a pike square formation in German. In the Hussite Wars of the 1420s and 1430s, the Czechs used short barreled ""houfnice"" cannons to fire at short distances into crowds of infantry, or into charging heavy cavalry, to make horses shy away. The word was rendered into German as "aufeniz" in the earliest attested use in
8 cm kanon vz. 28 pieces for transport, a feature also shared by the contemporary 10 cm houfnice vz. 28 and the later 8 cm kanon vz. 30 and 10 cm houfnice vz. 30 guns. The vz. 28 proved to be fairly successful as a field and mountain gun, but was a failure as an anti-aircraft gun. The Czech Army used the vz. 28 in limited numbers, but ordered its successor the vz. 30 in larger numbers. The vz. 30 lacked the vz. 28's firing table, otherwise their configuration, dimensions, and performance were largely the same. The Yugoslav Army ordered the vz. 28 who referred