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To do this, the British would fire air-bursting artillery shells as well as searchlights which would create dense clouds of smoke over a target. As a follow up, they would then fire tracer ammunition (primarily from 40mm bofors cannons) of varying colors. This created bright spots of light on the ground which helped direct troops. Additionally, they would use various colors of tracers (Red, Blue, Yellow) to indicate where armor, infantry and other groups would need to attack.