Battle of Arras

The British first launched a full-scale attack using the Livens Projector at the Battle of Arras on 9 April 1917 ... 

The Battle of Arras also saw the widespread use of the Stokes Mortar. Like the Projector, its design was extremely simple a steel tube raised at an angle by two struts. It fired four-inch mortar bombs, each containing two litres of gas. A well-trained crew could fire fifteen bombs and have them all in the air before the first one hit its target, with pin-point accuracy, as much as 1,000 yards away. 

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