Polish C4P Half Track for Artillery

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Samochód półgąsienicowy wz. 34 (literally "Half-track car, year 1934 model") was a Polish halftrack lorry. It was produced in a variety of variants, the best-known of them being the C4P artillery tractor used by the Polish Army in the period before World War II.

The vehicle was based on a 2.5 tonne Fiat 621 truck, licence-built by Polski Fiat in Poland at the time. In 1934 Edward Habich of the Bureau for Technical Studies of the Armoured Arms (BBT BP) designed a half-track version of the Fiat 621 lorry, initially dubbed the Mark 1934 halftrack cargo lorry (Polish: Półgąsienicowy samochód ciężarowy wz. 34).

C4P for heavy artillery

Intended for 120 mm wz.1878/09/31 guns (experimentally also for 155 mm howitzers and 105 mm wz.29 Schneider guns). Their frame was slightly shorter and was equipped with a special catch for the gun carriage. Initially the crew compartment was open-topped and covered only with a tarpaulin roof, later production models had a compartment enclosed in a steel and wooden box. Both variants had a bench for four artillerymen just behind the driver's compartment.

C4P for light artillery

Intended for 75 mm Schneider guns and 100 mm Škoda howitzers, as well as for transporting ammo and towing caissons. They were basically identical to the later heavy artillery variant, except that the cargo hold was equipped with two benches for three soldiers each.

C4P for anti-aircraft artillery

Intended as the basic tractor for Polish 75 mm wz.36 Star AA guns. They had a lengthened cargo hold with two benches for two soldiers each.