Halcyon Class Minesweepers HMS Seagull 1940
 
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HMS Seagull - Halcyon Class Minesweeper
HMS Seagull

Date of Arrival

Place

Date of Departure

Orders, Remarks etc

?

Scapa

8.2.40

 

9.2.40

Rosyth

10.2.40

 

10.2.40

Leith

8.3.40

11/2 Taken in hand for docking

24/2 Undocked, completes 7/3

8.3.40

Rosyth

9.3.40

 

10.3.40

Invergordon

11.3.40

 

12.3.40

Scapa

1.5.40

 

Source: ADM 199/184 HMS SEAGULL Minesweeping Operation PA3

From:   The Commanding Officer, HMS SEAGULL
Date:    15th March 1940
To:       Flag Officer in Charge, Invergordon. 

OPERATION P.A.3 

Line defined by four danbuoys laid by HMS ‘ Teviot ????’ in the vicinity of position 58 degrees 25 minutes North, 1 degree 14 minutes West. 

45 mines cut - N2 Mark 8 Star British moored mines, destroyed by rifle fire. 

HM Ships SEAGULL and Sharpshooter

Wind NNE, 2-3, weather overcast with snow showers. 

Remarks

Minesweeping - Halcyon Class Minesweepers

The formation as shown on the sketch was used, with SEAGULL passing about 50 yards or less to the leeward of the danbuoys and cutting them with her starboard sweep. This formation and procedure, it is considered, made it reasonably certain that the sweeps would pass over the line of mines and give a 100% skim, and also that it provided for the possibility of a sweep parting. 

On entering the area, Sharpshooter immediately cut a group of mines, and in so doing caught a mine in her otter which caused the float to dip. As this is a fairly common occurrence when sweeping a report was not immediately made. When this fact was reported I decided to accept the increased depth of Sharpshooter’s sweep for some minutes, as (a) although it is impossible to know what the increased depth of the sweep would be, experience in the flotilla  has shown that it may not amount to very much, (b) I did not wish to order Sharpshooter to heave out of the formation and lessen the certainty of a 100% skim, which I considered to b my object, especially as at least one mine had been proved to be at a wrong depth, (c) it was probable that the float would reappear at any time, which is usual in such cases. 

When Sharpshooter continued to cut mines with her port sweep and the float did not reappear, I was preparing to reconsider my decision, when she ceased to cut them. I then decided to carry on with the skim as before. Forty four mines (as counted subsequently) were swept up in about the southern mile and a half of the line, and from then on only one more was cut at about three miles from the southern end. Sharpshooter’s float then reappeared with a mine in the otter at the end of the sweep. 

As it is reasonably our aim that the increased depth of Sharpshooter’s sweep, whatever it was, remained constant, and assuming that the majority of the mines found their correct depth, it would appear that:

(a) The original mine or group of mines swept up were definitely at an incorrect depth of about 10˝ fathoms.

(b) The remainder of the mines swept up were at a depth below the surface of more than 10˝ fathoms but less than 15 fathoms. 

The float and kite wire settings were carefully rechecked at the conclusion of the sweep in each ship and as the tables used have stood the test of time and experience, there is no reason to suppose that there was any serious error in the depth of the sweeps, although some slight difference must have existed to account for the original mine being cut by Sharpshooter and not by SEAGULL.
 

Source: ADM 199/184 Oropesa trials SEAGULL & Sharpshooter (extracts)
 

Results obtained by towing Oropesa sweep at certain speeds, using settings given by SEAGULL

 

Operation PA 4. 

Princess Victoria and Teviot Bank are to lay deep Line D in Moray Firth extending for 16 miles in a direction 000 degrees from position 58° 20’ N, 2° 38’W spacing 150 feet. 

Princess Victoria is to embark 300 mines setting 110 feet. Teviot Bank is to embark 150 mines depth setting 110 feet to be laid with those remaining from Operation PA three. Depth setting for the latter to remain unchanged at 90 feet.  

When ready minelayers are to be sailed for Invergordon escorted by Express, Esk, Impulsive and Icarus. 

C in C Home Fleet is requested to detail two minesweepers to skim the line. Sweeps are to be adjusted to skim to a depth of 60 feet. Single Oropesa sweep is to be used.  

General procedure as for Operation PA three. 

C in C Rosyth is requested to arrange air cover. 

On completion minelayers and escort are to return to Immingham.  

For D D O D (M)
1215/16 (March 1940)

 

… In operation PA3 carried out on ????, of the first 150 mines laid 34 were cut by HMS SEAGULL and HMS SHARPSHOOTER, which were carrying out the skimming sweep. The remaining mines have been checked and depth settings were correct. The sweepers used Double Oropesa sweeps. Had a speed of 9 knots been maintained in fact, the sweeps would have cleared the mines. The talk on page 7 of CB 1937 shows that it is improbable that a speed of 8 knots could be maintained by ships keeping station. A speed of 7.5 knots would cause the wire to sag to 89 feet, and 7.0 knots to 95 feet. A sag of the sweep due to loss of speed appears the most likely cause of the failure. In future Single Oropesa sweep should be used for skimming operations. CB 1937 will be amended to make this point clear.

7.5.40

Scapa

?

 

24.6.40

Scapa

30.7.40

 

30.7.40

Aberdeen

5.8.40

1/8 Taken in hand for repairs, completes 5/8

5.8.40

Scapa

22.8.40

 

22.8.40

Rosyth

28.8.40

24/8 Taken in hand at Leith. Preparatory work prior to refit at Leith 

28.8.40

Leith

2.12.40

28/8 Taken in hand at Leith, refit and fitting LL sweep, completes 14/10

25/9 From C in C Home Fleet: SEAGULL requires a further 4 ˝ weeks and even new completion date is dependant on certain equipment being delivered in the next few days, completes 14/11

3/10 SEAGULL docked in Alexandra Dry Dock   

1/11 SEAGULL undocked from Alexandra Dry Dock, Leith, completes 30/11

2.12.40

Rosyth

7.12.40

 

8.12.40

Scapa

21.1.41

15/12 Britomart has been damaged in collision with SEAGULL. Repairs to SEAGULL can be made locally.

     

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This site was last updated 17 Januar 2012