Another Counter Battery Patrol, and more bombs dropped today; and more water in the carburettor, so an early return:
Log Book
Date: 26.6.18
Hour: 11.00
Machine type: RE8
No.: E27
Observer: Lt Roche
Time: 1 hr 10 m
Height: 3000
Course/Remarks: CBP. 4 bombs. Returned due to engine.
Diary
Wednesday June 26th. CBP. Dropped four bombs on houses. Late up & early down – water in carburettor.
Nothing to indicate where the bombs on houses were dropped, but it was probably somewhere in or around German-occupied Merville.
2nd Lt Roche
This was to be 2nd Lt Anthony Berthon Roche’s last flight as Greg’s observer. He was evidently still with 42 Squadron at least until 7 July 1918, according to the records of http://www.airhistory.org.uk/rfc/people_index.html, but Greg’s own papers contain no more information about him.
Back on Counter Battery Patrol after recovering from the flu, with Lt Roche (also recovered), meant a 5:30am start that was rewarded with a direct hit with a bomb on a bridge near Merville. Mac (Lt. Hugh McDonald), who died yesterday, was buried later in the day.
Log Book
Date: 25.6.18
Hour: 5.30
Machine type: RE8
No.: E27
Observer: Lt Roche
Time: 1 hr 30 m
Height: 3000
Course/Remarks: CBP. Direct hit on bridge. Wat. in Carb.
Diary
Tuesday June 25th. CBP at 5.30 am. Very heavy mist. Dropped bombs on bridge near Merville, (direct hit). Observer fired 100 rounds behind Merville.
Heavy low bands of clouds appeared about 6.45 to windward.
Engine became very rough owing to water in carburettor so came home. No Archie. No Huns.
Good landing.
Developed a cold as after effect of P.U.O.
Mac buried.
“Dropped bombs on bridge near Merville, (direct hit)”
An opportunistic departure from a counter battery patrol. Which bridge was it? Hard to tell, as there are so many, as this map extract shows:
Extract from a 1:20,000 map of Merville, May 1918 edition, with trenches revised to 19 June 1918. German works in red. Numbered squares are 1,000 yards. Map credit: IWM/TNA/GreatWarDigital
Merville still has still lots of bridges. One of today’s tourist information boards proudly says:
As the heart of the town is surrounded by water, it can only be reached by crossing one of the seventeen bridges.
It seems unlikely that even a direct hit with one of the 20 lb Cooper bombs that were carried by an RE8 would actually have brought a bridge down. And Greg would surely have proudly said so if he had done. (Spoiler alert: he did on a later occasion!)
Water in Carburettor
A recurrent problem, with the heavy mist and low cloud.
Lt. Hugh McDonald (Mac) Buried
Lt. Hugh McDonald lies buried at plot III.D.33 at Aire Communal Cemetery, next to his observer 2nd Lt. Cuthbert Alban Marsh at III.D.34.
After yesterday‘s crash on take-off from Rely, Marsh and McDonald both died in hospital. Greg did not fly – his final day off flying after the flu.
Monday June 24th. Marsh & Macdonald [sic, should be McDonald] both died in hospital. Marsh buried in afternoon. Did not fly.
So neither of them made it. 2nd Lt. Marsh, who had had such a lucky escape earlier in the month, had celebrated his 24th birthday just two days earlier, on 22 June 1918. Lt. McDonald was 19, the same age as Greg. A reminder, if one was needed, of how dangerous flying was even before anyone wished you harm.
Greg’s first day out of bed (just) after the flu was a bad day for the squadron, with a crash at Rely aerodrome.
Diary
Sunday 23rd. Got up, & walked round a bit feeling groggy. Macdonald [sic, should be McDonald] & Marsh spun into the ground & caught fire, both rescued & taken to hospital.
McDonald & Marsh Crash at Rely
Lt Hugh McDonald (as his name was spelt in the official report) was the pilot.
And 2nd Lt Cuthbert Alban Marsh was the observer, and was also Greg’s observer on his near-disastrous first day on the Front, when they crashed in crops at Trézennes. On that occasion, Marsh was thrown clear:
There were two hospital facilities at Aire-sur-la-Lys at the time. User mhifle of The Great War Forum says that the 54th Casualty Clearing Station came to Aire on 16 April 1918. This CCS was also known as the ‘1/2nd London CCS’. He gives its previous locations with the BEF in France as:
Hazebrouck 1 April 1915 to 31 July 1915
Merville 1 Aug 1915 to 28 March 1918
Haverskerque 29 March 1918 to 15 April 1918
At Aire, the 54th CCS joined No 39 Stationary Hospital, which was there from May 1917 to July 1918 according to The Long, Long Trail. So McDonald and Marsh may have been taken to one of these hospital facilities.
“British Casualty Clearing Station”
The Greg’s War collection includes the following aerial photograph captioned “British Casualty Clearing Station”, which is otherwise unidentified.
High-angle oblique aerial photograph from the Greg’s War Collection entitled “British Casualty Clearing Station”. Click for larger image.
It is possible that this was the 54th CCS at Aire (maybe with No 39 Stationary Hospital also in shot). The landscape looks similar to that just west of Aire, upstream along the Lys valley, near the village of Mametz – Mametz (Pas de Calais) that is, not Mametz (Somme).
A high-angle oblique view created in Google maps. (It’s not entirely successful, as Google has not 3D-imaged the area.) The aspect is looking northeast from just south of the Route de Mametz. Click to go to Google maps to see the location.
But I’m not entirely sure that this is the same place. In this instance, it’s hard to tell how much the landscape has changed over the years. Without any hard evidence of where the photo was taken, and without even knowing just where in or around Aire the 54th CCS was located, I can only identify it provisionally.
Another day in bed as Greg’s Spanish Flu, aka Merville Fever, continued. Still no flying for him. But what was the origin of Spanish Flu?
Diary
Saturday June 22nd. Stayed in bed all day.
Origin of Spanish Flu
After yesterday’s excursion into epidemiology, here’s a bit of a voyage into virology. (We’ll return to aviation soon enough.)
Let’s get one thing out of the way first: the origin of Spanish flu is probably not Spain. It is generally thought that the name came about because Spain’s neutrality in the First World War merely permitted more extensive reporting of the pandemic. See Trilla et al.Clinical Infectious Diseases47(5) 668–673 (2008) (https://doi.org/10.1086/590567) for more.
We now know – but in 1918 they didn’t – that the causative agent of flu is a virus. At the time, it was thought to be caused by a bacterium, Haemophilus influenzae, which is now known to be the cause of various other conditions, including some cases of bacterial meningitis.
Viruses
Like all viruses, influenza virus isn’t really a living entity. It’s a package of genetic material (in this case RNA rather than DNA) wrapped up in a protein-studded lipid (fatty) coat. It can’t reproduce on its own. It can only replicate by infecting a host cell and hijacking the cell’s replication machinery. The infected host then churns out vast quantities of progeny virus, and the cycle begins again.
Today we know what the virus looks like. Here is an electron micrograph of a recreated form of the 1918 Spanish Flu virus:
Negative stained transmission electron micrograph (TEM) showed recreated 1918 influenza virus particles (also known as virions). Photo Credit: Dr. Terrence Tumpey/ Cynthia Goldsmith, US Centers for Disease Control and Prevention’s Public Health Image Library (PHIL). Public domain image.
Surface Proteins and Subtypes
Among the proteins studding the lipid coat of the virus particles (which are in the order of 100 nm in diameter), two that are important for the way that the virus infects its host cells are haemagglutinin (abbreviated HA or H) and neuraminidase (NA or N). Haemagglutinin is involved in the virus binding to the host cell, and neuraminidase assists in viral trafficking. Here’s a schematic picture of a flu virus particle:
Schematic structure of influenza virus, showing haemagglutinin and neuraminidase on surface. Credit: Vincent Racaniello of the Virology Blog, Licensed under CCA 3.0.
Although there are three kinds of influenza virus, A, B and C, it is only influenza A that poses a serious threat to public health. The 1918 so-called Spanish Flu was an example of influenza A. We now know (see below) that it was a subtype known as H1N1, so called because it contains haemagglutinin of subtype 1 (of 16 known subtypes) and neuraminidase of subtype 1 (of 9). Formally, the Spanish Flu virus is therefore known as 1918 A(H1N1) influenza.
Reassortment
When a flu pandemic arises, it is often because of genetic reassortment of the virus. This arises when two different viruses infect the same individual (human or another susceptible species such as pigs or birds). Because the RNA in the nucleus is in different segments, these segments can reassort to give a new genetic combination. In this way, an H1N1 virus might reassort with an H5N3 virus to give an H5N1 virus, say (not a random example, but that is another story). And the human immune system might not have ‘seen’ this reassortment before – at least in the recent past – and therefore have no effective immunity against it.
And the Origin of Spanish Flu is…
…actually not clear. It seems that the reassortment mechanism just discussed did not give rise to the Spanish Flu virus in 1918. Taubenberger and colleagues, working in the mid-1990s with archival influenza autopsy materials collected in the autumn of 1918, sequenced the RNA of the virus and determined it to be an H1N1 subtype and similar to a bird flu virus from an unknown source. (For a review, see Taubenberger & Morens “1918 Influenza: the Mother of All Pandemics” Emerg Infect Dis. 2006;12(1):15-22 (https://dx.doi.org/10.3201/eid1201.050979)). Similar to a bird flu virus, that is, but not exactly the same: it had a mutation, or mutations, that enabled it to infect humans – and pigs. So this proposed bird flu-like virus seems to have been new – immunologically speaking – both to us and to pigs.
It has to be said that not everyone goes along with the Taubenberger bird virus origin theory. A lively debate in the pages of Nature testifies to that. And even Taubenberger says that it is not just a question of a single mutation arising in a pre-existing H1N1 bird flu. That theory is discounted by the large number of mutations found between the 1918 virus and known bird flu viruses. For the moment, the answer to the question “what is the origin of Spanish Flu?” is the unsatisfactory “we don’t really know”. But the bird flu theory is still a contender.
A Live Issue
Intriguingly, this is not merely a question of historical interest. The legacy of the 1918 Spanish Flu is still with us today. The reason that Taubenberger & Morens called the Spanish Flu pandemic in 1918 “the mother of all pandemics” in the title of their 2006 review article is that, in their words :
All influenza A pandemics since that time, and indeed almost all cases of influenza A worldwide…, have been caused by descendants of the 1918 virus.
Yet another long shadow cast from the years of the Great War.
Greg’s flu – ‘Merville Fever’ as he called it yesterday – continued. Today he said it was Spanish Flu. Unsurprisingly, he did not fly.
Diary
Friday June 21st. Stayed in bed all day. (Known in England as ‘Spanish Flu’.)
Spanish Flu
Greg equates what was evidently known within 42 Squadron as ‘Merville Fever’ with Spanish Flu. Possibly the words in brackets in his diary entry were added at a later date. But in any event, can he really have been talking about the same ‘Spanish Influenza’ that killed so many in 1918 and 1919? Especially if, as he said yesterday, it was merely “a sort of ‘flu lasting three or four days”?
Perhaps surprisingly, the answer was quite probably ‘yes’ – for a couple of reasons. (Nice bit of epidemiology coming up.)
The W-Curve
First, he was the right age not to be too badly affected. At 19 and in good health he would have had a fairly robust constitution. Furthermore, the 1918-19 influenza pandemic did not affect all age groups equally. Mortality was greatest among children under four and among the elderly – two immunocompromised groups – as one might expect. Also, there was also a curious minor peak of mortality among those aged 25-34, but Greg’s age put him only on the lower slopes of that peak.
Because of the minor peak among 25-34 year olds, a plot of mortality rate against age for the 1918-19 pandemic became known as the W-curve. This contrasts with the more expected U-curve that was seen in earlier years between pandemics:
“W-” and “U-” shaped combined influenza and pneumonia mortality, by age at death, per 100,000 persons in each age group, United States, 1911–1918. Influenza- and pneumonia-specific death rates are plotted for the interpandemic years 1911–1917 (dashed line) and for the pandemic year 1918 (solid line). Figure 2 from Taubenberger JK, Morens DM. 1918 Influenza: the Mother of All Pandemics. Emerg Infect Dis. 2006;12(1):15-22. https://dx.doi.org/10.3201/eid1201.050979.
The Three Waves
Secondly, as shown by the following plot of mortality rate against time (not age of patient, as in the above figure) there were three waves of the 1918-19 influenza pandemic, of unequal lethality. They were:
We see this three-wave pattern even more clearly from the UK data shown in Figure 1 of Taubenberger & Morens (2006), cited above:
Three pandemic waves of ‘Spanish Flu’: weekly combined influenza and pneumonia mortality, United Kingdom, 1918–1919.Figure 1 from Taubenberger & Morens (2006) https://dx.doi.org/10.3201/eid1201.050979
Greg’s illness was in the first wave, which had the least rate of mortality of the three waves.
Not a Great Threat
So all in all, Spanish Flu – or Merville Fever – was by this stage not the great threat that it became, particularly for a young man of his age. At the time, it was quite plausibly regarded as “a sort of ‘flu lasting three or four days”. This is entirely in line with the observation by Taubenberger & Morens (2006) that:
Despite the extraordinary number of global deaths, most influenza cases in 1918 (>95% in most locales in industrialized nations) were mild and essentially indistinguishable from influenza cases today.
With Lt Roche having contracted flu yesterday, today it was Greg’s turn to be struck down by ‘Merville Fever’.
Diary
Thursday June 20th. Started with an attack of Merville Fever. A sort of ’flu lasting three or four days. Called P.U.O. (Placed Under Observation).
Had a letter from Kenneth & one from Alice.
So no flying for Greg. But two letters from the family in Holyhead must have cheered him up.
Kenneth Gregory and Alice Gregory
Kenneth was an elder brother, a mining engineer who worked with their father managing the quarry on Holyhead mountain. Alice was their sister, and a Queen Alexandra Nurse. She was also, in Oscar Wilde’s memorable phrase, excessively pretty.
Alice Gregory, Greg’s sister, picking apples, probably in the orchard at the family home in Holyhead, North Wales. Click for larger image. Photo: Greg’s War Collection
On another damp day around the River Lys, Greg takes Lt Watkins as observer, since Roche has flu. Central Wireless Station tells them to reconnoitre an area by l’Épinette, southeast of Merville. But they didn’t see any guns firing and the damp air leads to water in the carburettor again.
Log Book
Date: 19.6.18
Hour: 3.30
Machine type: RE8
No.: E27
Observer: Lt Watkins
Time: 1 hr 10 m
Height: 3000
Course/Remarks: CBP. Came down due to water in
carburettor.
Diary
Wednesday June 19th. E27. Roche got an attack of the ‘flu’. Took up Watkins as observer, saw one Hun.
Asked C.W.S. for a target & got R VII. Went over to reconnoitre square R7 but owing to smoke from a fire just to windward was unable to see any guns firing in that square. Weather pretty dud & damp.
“Asked C.W.S. [Central Wireless Station] for a target”
CWS was the squadron’s Central Wireless Station. This station operated one of the squadron’s two radio receivers. The other was at Station Headquarters for practice and tests. As the General Staff’s “Co-operation of Aircraft with Artillery” booklet (SS 131) explains:
…the Central Wireless Station should be at some central position in the corps area sufficiently far back to prevent jambing. This station acts as a link between the squadron commander and his machines working on the line, and is of great value in preventing incipient failures in their initial stages. … Its utility is largely dependent on quick telephone communication to the squadron and to batteries. Whenever possible, therefore, it should be located near Corps Heavy Artillery Headquarters, whose direct lines run to the above units. At this station are also taken weather reports, hostile aircraft reports and, in case of sudden enemy bombardments or attacks, calls for reinforcing machines.
Square R7
This would be square R7 in Sheet 36A (zone RA), 2 miles (3.2 km) SSE of Merville, near Lestrem. At the time, there was some kind of well defended German post or position there, at l’Épinette:
Extract of 1:20,000 ‘Harassing Fire’ map showing Square R7 of 1:40,000 Sheet 36A and l’Épinette. This was the square given by the Central Wireless Station. Red markings show German trenches and wire entanglements. Black marking show centres of activity, occupied areas and numbered targets. Triangles indicate dumps, and the flag shows a headquarters position. The map is dated 27 June 1918, with trenches correct to 16 June 1918.
Nowadays, l’Épinette is on the southern edge of Merville-Calonne Airport:
Tuesday June 18th. E27. Counter Battery Patrol. Clouds low, atmosphere very damp, engine struggling along with carburettor nearly full of water. Eventually started backfiring, so made tracks for home. Good landing.
This wouldn’t be the last occasion of water in the carburettor.
Greg’s run of counter battery patrols continues. This time, clouds both interfere and provide a refuge. Water in the carburettor was a problem.
Log Book
Date: 17.6.18
Hour: 8.20
Machine type: RE8
No.: E27
Observer: Lt Roche
Time: 2 hrs 25 m
Height: 4300
Course/Remarks: CBP. Water in carburettor.
Engine rough.
Diary
Monday June 17th. E27. Counter Battery Patrol.
Very cloudy. Climbed up above clouds, very pretty but cold. Hun machines very active.
Dived down through clouds and got in a rain storm. Too dud to get any information.
