The German SD 2 "butterfly bombs" were small air-dropped anti-personnel/fragmentation devices. Dropped in containers that opened at a pre-determined height, the 'wings' opened and rotated the device thus arming it. It could be fitted with a variety of fuses - from impact to delay. Various colours from green/grey to yellow were dropped, some with red or yellow stripes on the wings.
The first use of the butterfly bombs was in Ipswich in late October 1940. Later attacks on Grimsby, Cleethorpes and Hull in June 1943 caused tremendous loss of life and disruption to the area.
The Ministry of Home Security issued warning pamphlets regarding the bombs. A Ministry of Information film detailed the dangers of the butterfly bombs.
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