World War Two  - Air Dropped Ordnance
The Sd1 was dropped in various sizes of containers & had a limited use within the United Kingdom but were widely used on the Russian Front. 
Including: Sd1, Sd4 & the Sd10.
Anti-personnel (fragmentation) bombs were designed to be used 
against troop concentrations & also on airfields etc. Some were fitted with 
delay action fuzes & sometimes anti-handling fuzes.