Mortier 280 mm TR de Schneider sur affût-chenilles St Chamond

The Mortier de 280 TR modèle 1914 Schneider sur affût-chenilles St Chamond was a French self-propelled siege howitzer designed during the First World War and used during the Second World War. == History == Before the First World War, the doctrine of the French Army was geared towards a war of rapid maneuver.