U-boat patrols

Patrol info for U-21

DepartureArrival / FateDuration
22 Oct 1939Kiel8 Nov 1939Kiel18 days


Officers *

Kptlt. Fritz Frauenheim

Oblt. Robert Bartels

Patrol description

Mine laying operation in the Firth of Forth.

Daily positions, sinkings and allied attacks during the patrol of U-21

We have 2 daily positions for the 18 days U-21 was at sea.

Departure from Kiel on 22 Oct 1939.
23 Oct 1939 - 24 Oct 1939 - 25 Oct 1939 - 26 Oct 1939 - 27 Oct 1939 - 28 Oct 1939 - 29 Oct 1939 - 30 Oct 1939 - 31 Oct 1939 - 1 Nov 1939 - 2 Nov 1939 - 3 Nov 1939 - 4 Nov 1939 - 5 Nov 1939 - 6 Nov 1939 - 7 Nov 1939 -
Arrival at Kiel on 8 Nov 1939.

Ships hit by U-21 during this patrol

Date U-boat Commander Name of ship Tons Nat. ConvoyMap
21 Nov 1939U-21Fritz Frauenheim HMS Belfast (35) (d.) [Mine]11,500brA
24 Feb 1940U-21Fritz Frauenheim Royal Archer [Mine]2,266brFN-100B

1 ship sunk (2,266 tons) and 1 ship damaged (11,500 tons).

We have a picture of this vessel.
(d.) means the ship was damaged.
[Mine] indicates the vessel was hit by a mine laid by said U-boat.

General Events during this patrol


4 Nov 1939. U-21 laid nine mines in the Firth of Forth, which later resulted in the sinking of two ships and badly damaged the light cruiser HMS Belfast.

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Attacks on U-21 during this patrol

6 Nov 1939
HMS Sealion (Lt.Cdr. B. Bryant, RN) fired six torpedoes at U-21, all of which missed their target.

About this data
If you believe we have missed an attack on a German U-boat in this listing please let us know.

Mine-laying operations during this patrol

U-21 laid mines on the following dates during this patrol:

4 Nov 193923h4400h53AN 0537Firth of Forth9 TMB

See all patrols for U-21

* These are officers that later became commanders themselves.

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