Operation Siegfried (Englean Kaiserreich)
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| Operation Trident | |
|---|---|
 Gerät Greta mushroom cloud | |
| Information | |
| Country |  Englean Kaiserreich |
| Test site | Imperial Test Site Heimarch, Heimarch Archipelago |
| Date | 15 July 1962 |
| Number of tests | 4 |
| Test type | air-drop |
| Max. yield | 11 megatonnes of TNT (46 PJ) |
| Test series chronology | |
Operation Siegfried (Unternehmen Siegfried) was a nuclear test conducted by the Englean Kaiserreich, the first test of a thermonuclear warhead by the Kaiserreich. A total of four tests were conducted, with the highest recorded intensity being 11 megatons of TNT. This test, involving Gerät Greta, was not intended to be of such a high magnitude - the highest expected magnitude was to be 5 MT. It has been determined that a mixture of the fuel used for the weapon was of an incorrect concentration, which caused 7 MT to be from fusion and the subsequent 4 MT being from fusion reactions. This fuel mixture was then tested in the following test, Operation Blitz.