The Arbalète sauterelle type A allowed bombs to be thrown into trenches beginning what was called what?
Trench warfare Trench warfare is a type of land warfare using occupied fighting lines consisting largely of trenches, in which troops are significantly protected from the enemy's small arms fire and are substantially sheltered from artillery. The most famous use of trench warfare is the Western Front in World War I. It has become a byword for stalemate, attrition, sieges and futility in conflict.
New Zealand Tunnelling Company The New Zealand Tunnelling Company (also "New Zealand Engineers Tunnelling Company") was a tunnel warfare unit of the Royal New Zealand Electrical and Mechanical Engineers during World War I which specialised in sapping and mining. The tunnelling companies were occupied in offensive and defensive mining involving the placing and maintaining of mines under enemy lines, as well as other underground work such as the construction of deep dugouts for troop accommodation, the digging of subways, saps (a narrow trench dug to approach enemy trenches), cable trenches and underground chambers for signals and medical services. The unit is particularly known for its role at Carrière Wellington and during the Battle of Arras.