Jutland Gunnery Log of HMS Lion

The Dreadnought Project website provides gunnery log data for HMS Lion at the Battle Of Jutland.


The source is the Beatty Papers archive at the Royal Museums Greenwich, Reports on gunnery range and rate of fire, 4 Jun-23 Oct 1916.

A copy of the log as transcribed on the Dreadnought Project web page is included here:

Range vs Salvo Time Plot

Using the gunnery log a plot of range vs salvo time was generated. Where available, the spotting corrections were applied to the ranges for the subsequent salvos. Bearing data was used to distinguish salvos fired to port (red) or starboard (green). Alterations of course (A/C in the Remarks column of the table) are shown using red (port) or green (starboard) symbols. Salvo data points are marked as “Salvo near target” for spotting entries which state ‘hit’, ‘straddle’, or give a portion of the salvo short and no large range correction. All times are p.m., GMT.

Additional lines on the plot indicate the times of the 180 degree turn at the end of the ‘Run to the South’, the 360 degree circle of the British battlecruisers around 7 p.m., and the destruction of the four ships that blew up during the daylight action. The four destruction times are from Campbell (Reference 1) and may not agree with the clock used for the gunnery data.

Comparison with Official Despatches

The following is a comparison of the gunnery log with the “Captain’s Report, H.M.S. Lion” in the Official Despatches (Reference 2). [note the then-current English spelling of dispatch]

Salvos between 3.47.5 (3 hours, 47 ½ minutes) and 4.33 were all fired to port. This is the engagement with the German battlecruisers in the ‘Run to the South’. The Official Despatches are consistent:
Enemy opened fire at 3.47 p.m., Lion replying half a minute later…”
(Reference 2, pages 143-144, paragraphs 2-5).

At 4.36 the log remarks state:
“Alteration of course of 16 Points. Enemy Battle Fleet ahead.”
The Official Despatches give a slightly different time:
“At 4.38 p.m. the enemy Battle Fleet was sighted ahead, and course was altered 16 points to North …”
(Reference 2, page 144, paragraph 6).

The log shows a firing gap of 15 minutes between the last salvo of the ‘Run to the South’ at 4.33 and the first salvo on the northerly course at 4.48. This contradicts the statement in the Official Despatches that the Lion reopened fire at 4.38 (Reference 2, page 144, paragraph 7).

Salvos between 4.48 and 5.04 were all fired to starboard. This is the engagement with the German battlecruisers in the ‘Run to the North’.

The log shows a firing gap of 35.5 minutes between 5.04 and 5.39.5 where the log states:
“Enemy went away in the mist and smoke.” (listed after 5.08)
“Left Hand Battle Cruiser. It is too indistinct to lay on at present.” (5.12)
“Caught a glimpse of the enemy.” (5.33)
This is roughly consistent with the Official Despatches, which state:
“At 5.12 p.m. Lion ceased fire owing to the enemy being obscured, and did not reopen until 5.41 p.m. …”
(Reference 2, page 144, paragraph 9).

Salvos between 5.39.5 and 6.01.5 were fired in misty conditions at the head of the German fleet. The salvo at 6.03 was fired at a cruiser. The Official Despatches continue:
“ … and did not reopen until 5.41 p.m. The visibility at this time was decreasing, and when fire was reopened on a ship that appeared to be of the Konig class… ”
(Reference 2, page 144, paragraph 9).

The log shows a firing gap of 13.5 minutes between 6.03 and 6.16.5. The Official Despatches state:
“Defence and Warrior now crossed Lion’s bow …. This caused Lion to cease fire and to lose touch with the enemy.”
(Reference 2, page 144, paragraph 12).

Salvos between 6.16.5 and 6.31.5 were the shortest ranges to enemy capital ships in the battle, down to about 8300 yards. The Official Despatches state:
“At 6.21 p.m. the Third Battle Cruiser Squadron was sighted … and Lion reopened at distant ships on the starboard beam (Konig class?).”
(Reference 2, page 145, paragraph 13).
No mention is made in the despatches of the target of the eight salvos between 6.16.5 and 6.21, but the gunnery log remarks at 6.14 say:
Battle Cruiser on Star: beam. Green 93 Left Hand ship.”

The log shows a firing gap of 42 minutes between 6.31.5 and 7.13.5. This interval includes the 360 degree circle to starboard which became a contentious issue in the preparation of the Harper track charts (Reference 3, pages 431-439). The Official Despatches indicate the circle, but differ about firing:
“Course was continued to be altered to starboard to close the enemy and at 6.37 p.m. was altered to E.S.E.; at 6.44 to S.E., and 6.48 p.m. to S.S.E.
At 6.53 p.m. speed was reduced to 18 knots to keep station on the Battlefleet, who were leading away to port owing to a Destroyer attack. Lion continued to engage the leading ship of enemy. occasionally ceasing fire when he became invisible. …”
(Reference 2, page 145, paragraph 14).
“The ship continued to circle to starboard.”
(Reference 2, page 145, paragraph 15).

Salvos between 7.13.5 and 7.16 have no obvious target, but the gunnery log remarks for 7.23 state:
“Left of three Battle Cruisers, Green 90.”
The Official Despatches state:
Fire was reopened on the leading ship of the enemy at 15,000 yards at 7.15 p.m….”
(Reference 2, page 145, paragraph 16).

The log shows a firing gap of 63 minutes between 7.16 and 8.19, followed by 15 closely spaced salvos at ranges around 10,000 yards between 8.19 and 8.28. The log remarks for the first salvo at 8.19 state:
“At ship 2 masts 3 funnels.”
Campbell says that the target was the light cruiser Pillau (Reference 1, page 253). The log remarks for 8.21 state:
“Left hand Battle Cruiser.”,
possibly indicating a change of target prior to the salvo at 8.22.
The Official Despatches state:
“… The enemy was still not sufficiently visible to open fire, and this continued until 8.21 p.m., when the flashes of his guns were again seen on our starboard beam.” At 8.23 p.m. Lion opened fire with rapid salvoes on his leading ship, either Lutzow or Konig class. … Lion ceased fire at 8.30 p.m.”
(Reference 2, page 145, paragraphs 16 and 17).


  1. Campbell, John, “Jutland, An Analysis of the Fighting,” 1986.
  2. “Battle of Jutland 30th May to 1st June 1916 Official Despatches with Appendixes,” 1920.
  3. “The Beatty Papers,” Volume II, 1993.

1909 Fleet Exercise

This scenario is a fictional British fleet exercise in 1909, designed to examine the idea that dreadnoughts “… were equal to any two and a half battleships at present existing.” [Reference 1]
The Red force, dubbed the ‘Royalist Fleet’, consists of all the currently operational dreadnought battleships and dreadnought armoured cruisers (later renamed battlecruisers) . It sails south from Rosyth to confront the Blue force, dubbed the ‘Parliamentary Fleet’, consisting of twice the number of pre-dreadnought battleships and armoured cruisers. The Red force includes the newest destroyers and the Blue force has a larger number of older destroyers. Both forces have scout cruisers of the latest operational classes.

The guns of the Invincible are penalized for the problems associated with the electrical turret mechanisms. These problems were never resolved, and the equipment was replaced with standard hydraulic gear in 1914. [Reference 2]

The code AI ran the blue side’s forces.

The sea conditions and orders of battle are listed on Page 1 of the Narrative file:

Force reports:

Plots and commentary:
The Red force cruising formation has the Invincible class ahead of the dreadnoughts, the destroyer flotilla stationed on the port bow of the flagship Dreadnought, and the scout cruisers in a line abreast screen ahead. The Blue force cruising formation has two battleship divisions in line ahead, two armoured cruiser divisions stationed ahead to port and starboard, two destroyer flotillas stationed abeam either side of the flagship Lord Nelson, and the scout cruisers in a line abreast screen ahead.
After the initial sightings, both sides deploy to port. The Red force attempts to use its speed advantage to gain a downwind position.

Once the battle lines open fire, the Blue force reverses direction to engage on parallel courses. Blue divisions adopt quarter line formations to allow following ships to be clear of the smoke from those ahead. This can be seen on the plot as parallel blue line segments. The Red heavy ships initially concentrate on the leading Blue battleships, but as the range closes and the Blue armoured cruisers’ fire becomes more effective, the Indomitable’s division shifts fire to the Warrior’s division. The leading Blue ships take significant damage, but the trailing Blue ships are firing undisturbed.

The faster Red force pulls ahead and edges to starboard to cross Blue’s line of advance. The Blue battle line turns away to keep gun arcs open. The scout cruisers fight their own battle between the lines, but the Blue scouts take damage from Red battleship secondary guns.

The Red force, having expended most of its armour piercing shells, and under threat from a visible Blue torpedo launch, turns away and makes smoke to break off the engagement.

End of game status:
The Red force of dreadnought type ships inflicted greater damage than it received, but left almost half of the Blue heavy ships undamaged. For the number of 12 inch shell hits, relatively little critical damage was inflicted. This was due to the defects of the shells, most of which exploded prematurely from the sensitivity of the lyddite filler, or shattered on face-hardened armour when striking at an angle from the perpendicular. It is possible that umpires of an actual fleet exercise would have judged many of the damaged ships to be sunk.
The short range of the torpedoes (3,000 yards maximum) made the destroyers ineffective in this scenario.

Gunnery logs:

1. Fisher, Sir John, “Naval Necessities,” The Fisher Papers, Vol. II, page 149.
2. Roberts, John, “British Battlecruisers 1905-1920,” pages 84-85.

WW1 Naval – Goeben Ambush

1st Cruiser Squadron

This scenario, occasioned by a recent TMP discussion, assumes that the 1st Cruiser Squadron commanded by Troubridge was able to predict the future track of the Goeben and arrange a dawn attack on August 7th, 1914. The 1st and 2nd divisions of the 9th Flotilla have sufficient coal to accompany the cruisers and are positioned for a torpedo attack at first light. Neither of these conditions were likely. The Breslau was omitted from the scenario since she had separated from the Goeben the previous evening and did not rejoin until 10:30 am.

The code AI ran both side’s forces.

While the torpedo attack was evaded, the necessity for the Goeben to parallel the torpedo tracks for several minutes allowed the 1st Cruiser Squadron to close to around 4,ooo yards and achieve a significant number of damaging hits. At such short range, some lower hit probability reductions are applied (e.g., those for the concentration of several batteries on one target). Eventually the Goeben sinks, primarily due to flooding of the unarmored forward and aft portions of the ship. The Goeben’s speed loss was caused by flooding, and not by any direct hits on machinery spaces.

The sea conditions and orders of battle are listed on Page 1 of the Narrative file:

Force reports:


End of game status:

Gunnery logs:

WW1 Naval – Dogger Bank

1st and 2nd Battle Cruiser Squadrons with the German line in the distance.

This scenario, based on the Battle of Dogger Bank (January 23, 1915), was an attempt to test the AI code against a human player. Information used by the human player was limited as much as possible to what would be available in an actual game.

The sea conditions and orders of battle are listed on Page 1 of the Narrative file:

Force reports:

Plot from 0710 to 1610 Hours

The single lines (red for British, blue for German) show the movement of the forces prior to contact. When contact was made, the individual ships were set out into their cruising formations. The British Battle Cruiser Force was in two squadrons in line ahead with a line abreast screen of one light cruiser squadron. The Harwich force was in three flotillas, each lead by a light cruiser. The German battle cruisers were in a single line ahead, with a circular cruiser screen ahead and two flotillas flanking the battle cruiser line.

Plot from 1616 to 1815 Hours

The Battle Cruiser Force was headed north-east at the time that the Harwich Force sighted smoke to the south-east. The BCF then reversed course to the south-east. The cruiser screen would take some time to regain station since the cruiser’s design speeds were only 25 knots.

Sighting of a German light cruiser heading west by the destroyers of the Harwich force occurred at 16:45. The human player assumed that heavier ships would be following this screening cruiser. He therefore continued to the south-east to get between the enemy and his base.

Sighting of British battle cruisers at 16:54 prompted the deployment at 16:55 of the Aufklarunggruppe (A.G.). The battle cruisers of I.A.G. maintained course to the west to engage to starboard and allow the wind to carry smoke away from the direction of the enemy. The light cruisers of II.A.G. formed up and took station 3 NM ahead. Once the battle cruisers opened fire, the German flotillas took station on the disengaged side.

Since the light forces took only a limited part in the later action, the simplified plot showing only the battle cruisers will be discussed. The Lion opened fire at 17:05, beyond the range of the German guns. I.A.G turned north to close the range, then back to north-east when in effective range. The two lines passed on opposite courses. Once the British had achieved a position between the Germans and their base (to the south-east), they reversed course to the north. Smoke interfered with the fire of the British line, so the formations were changed to line-of-bearing, 3 points to port, and the 2nd BCS was stationed on the port quarter of the 1st BCS. This took some time to achieve, during which the British received significant damage.

The game was ended when damage caused the German line to attempt to break off to the north-east. The time (18:15) was past nightfall for this date, and the code does not currently account for night conditions.

End of game status:

Capital ship gunnery logs organized by unit: