1. Fuse Division - 1. Sicherungs-Division
The division was set up in February 1941 for security tasks in the area of the southern North Sea from Hanstholm to Schelde .  The Staff Headquarters was in the following locations Netherlands: Scheveningen / The Hague , from June 1942 in Utrecht -Oudenrijn and from April 1945 in Haarlem .
Initially, the division was subordinate to the Commander of Security West .  On November 1, 1941, she was the securing of the North Sea Commander (BSN) assumed command default. The last change in the subordination took place in March 1942 with the dissolution of the BSN. The division was subordinated to the commanding admiral in the Netherlands . At the end of the war the 1st Security Division was in the Netherlands and was taken prisoner by the Allies here.
- Sea captain Heinrich Bramesfeld (February 1941 to November 1941), former chief of the 36th minesweeping flotilla and from October 1941 to November 1941 also commander of the 2nd security division , later commander of the 7th security division
- Captain of the Sea / Rear Admiral Joachim Plath (November 1941 to February 1943)
- Rear Admiral Waldemar Winther (February 1943 to April 1944)
- Sea captain Hermann Knuth  (April 1944 to May 1945)
- 13. Outpost Flotilla 
- 20th outpost flotilla 
- 15. Minesweeping Flotilla  (dissolved in 1943)
- 22. Minesweeper 
- 32. Mining search flotilla 
- 34. Minesweeper 
- 8. Lock breaker flotilla
- 1st clearing boat flotilla with the escort ship Zieten (ex M 138 )
- 1. Minensuchflottille ( Rotterdam )
- 11th minesweeping flotilla ( Wesermünde ) (dissolved February 1945)
- 32nd Minesweeper ( Terneuzen )
- 34. Mining search flotilla ( Ijmuiden )
- 8. Barrier breaker flotilla ( Vlaardingen )
- 13th Outpost Flotilla (Rotterdam) (disbanded January 1945)
- 14. Outpost Flotilla (Rotterdam)
- 20th Outpost Flotilla (Rotterdam)
- 1. Artillerieträgerflottille (Rotterdam)
- 9th clearing boat flotilla (Vlaardingen) with the escort ship Alders (ex M 526 , ex M 126 )
- Friedrich Ruge: In the coastal apron: mine search, escort, submarine hunting, outpost service . Lehmann, 1974, ISBN 978-3-469-00512-0 , pp. 71 ( google.de [accessed on January 9, 2019]).
- Wolfgang Hausen: German Soldier Yearbook . Schild Verlag, 2000, p. 148 ( google.de [accessed on January 9, 2019]).
- In this function, awarded the Knight's Cross to the Iron Cross in September 1944 and after the war with the Federal Border Guard See.
- Gordon Williamson: Kriegsmarine Coastal Forces. Bloomsbury Publishing, 2012, ISBN 978-1-84603-820-4, S. 5 ( google.de [accessed on July 18, 2020]).