Officer Commanding the Military Wing With the outbreak of
First World War, Trenchard was appointed Officer Commanding the Military Wing of the
Royal Flying Corps, replacing Lieutenant-Colonel
Sykes. This appointment put him in charge of the Royal Flying Corps's home garrison, which retained one-third of the Corps' total strength. Its headquarters were at
Farnborough, and being disappointed about remaining in England he applied to rejoin his old regiment in France. However, the head of the RFC, General
Sir David Henderson, refused to release him. Trenchard's new duties included providing replacements and raising new squadrons for service on the continent. He initially set himself a target of 12 squadrons; however,
Sefton Brancker, the Assistant Director of Military Aeronautics, suggested that this should be raised to 30, and
Lord Kitchener later increased the target to 60. In order to begin the task of creating these squadrons, Trenchard commandeered his old civilian training school at Brooklands, and then used its aircraft and equipment as a starting point for the establishment of new training schools elsewhere. In early October 1914, Kitchener sent for Trenchard and tasked him with providing a battle-worthy squadron forthwith. The squadron was to be used to support land and naval forces seeking to prevent the German flanking manoeuvres during the
Race to the Sea. On 7 October, only 36 hours later,
No. 6 Squadron flew to
Belgium, the first of many additional squadrons to be provided. Later in October, detailed planning for a major reorganisation of the Flying Corps' command structure took place. Henderson offered Trenchard command of the soon-to-be created
First Wing. He accepted the offer on the basis that he would not be subordinated to Sykes, whom he distrusted. The next month, the Military Wing was abolished and its units based in the United Kingdom were re-grouped as the Administrative Wing. Command of the Administrative Wing was given to Lieutenant Colonel
E B Ashmore.
Commander of the First Wing Trenchard took up command of the First Wing in November 1914, establishing its headquarters at
Merville. On arrival he discovered that Sykes was to replace Henderson as commander of the Royal Flying Corps in the Field, making Sykes Trenchard's immediate superior. Trenchard bore Sykes some animosity and their working relationship was troubled. Trenchard appealed to Kitchener, by then the
Secretary of State for War, threatening to resign. Trenchard's discomfort was relieved when in December 1914 Kitchener ordered that Henderson resume command of the Royal Flying Corps in the Field. The R.F.C.'s First Wing consisted of Nos
Two and
Three Squadrons flying in support of the British Army's
IV Corps and
Indian Corps. After the
First Army of the BEF under General
Sir Douglas Haig came into being in December 1914, the First Wing provided support to its operations. In early January 1915 Haig summoned Trenchard, who on the 18th of that month was promoted to brevet lieutenant colonel, to explain what might be achieved in the air war. During the meeting, Haig brought him into his confidence regarding plans by the First Army for a March attack in the Merville/
Neuve Chapelle region. After aerial photographic reconnaissance had been gathered, the British plans for the attack were reworked in February in consequence. During the
Battle of Neuve Chapelle in March the R.F.C., and especially the First Wing, supported the operation. This was the first time that aircraft were used as bombers with missiles strapped to the wings and fuselage as opposed to being released by hand which had happened earlier in the war. However, the bombing from the air had little effect due to limited weight payload capacity, and the
Royal Artillery disregarded the information provided by the R.F.C.'s airmen. Prior to the British First Army's offensives at
Ypres and
Aubers Ridge in April and May, the First Wing's crews flew reconnaissance sorties using aerial cameras over the German lines. Despite the detailed information this provided and the improved air-artillery cooperation during the battles, the offensives were inconclusive. At the end of this engagement Henderson offered Trenchard the position as his
chief of staff. He declined the offer, citing his unsuitability for the role, although his ambition for command may have been the real reason. In any case, this did not stop his promotion to
full colonel in June 1915. Trenchard was promoted to brigadier-general and appointed Officer Commanding the R.F.C.'s units in France. He was to serve as the head of the R.F.C. in the field until the early days of 1918. In December 1915, when General Haig was appointed as
commander-in-chief (C-in-C) of the
British Expeditionary Force (BEF), Haig and Trenchard re-established their partnership, this time at a higher level. In March 1916, with the RFC expanding, Trenchard was promoted to the temporary rank of
major-general. In January 1917 the rank was made permanent. Trenchard's time in command of the R.F.C. on the
Western Front was characterised by three priorities. First was an emphasis on support to and co-ordination with ground forces. This started with reconnaissance and artillery co-ordination, and later encompassed tactical low-level bombing of enemy ground targets. While he did not oppose the strategic bombing of Germany in principle, he rejected moves to divert his forces on to long-range bombing missions as he believed the strategic role to be less important and his resource to be too limited. Secondly, he stressed the importance of morale, not only of his own airmen, but more generally the detrimental effect that the presence of an aircraft had upon the morale of enemy ground troops. Finally, he had an unswerving belief in the importance of offensive action. Although this belief was widely held by senior British commanders in the war, the R.F.C.'s routinely offensive strategy resulted in the loss of many of its air crews and machines, and some doubted its military validity. Following the
Gotha raids on London in the summer of 1917, the Government considered creating an air force by merging the R.F.C. and the
Royal Naval Air Service. Trenchard opposed this, believing that it would dilute the air support required by the ground forces in France. By October he realised that the creation of an "Air Force" was inevitable and, seeing that he was the obvious candidate to become the new
Chief of the Air Staff, he attempted to bring about a scheme whereby he would retain control of the flying units on the Western Front. In this regard he was unsuccessful, and he was succeeded in France by Major-General
John Salmond.
Chief of the Air Staff (1st appointment) After the Air Force Bill received the
Royal Assent on 29 November 1917, there followed a period of political manoeuvring and speculation over who would take up the new posts of
Air Minister,
Chief of the Air Staff and other senior positions within soon-to-be-created
Air Ministry. Trenchard was summoned back from France, crossing the Channel on a
destroyer on the morning of 16 December. At around 3 pm he met newspaper proprietor
Lord Rothermere, who had recently been appointed as Air Minister by
David Lloyd George for political reasons. Rothermere offered Trenchard the post of Chief of the Air Staff and before Trenchard could respond explained that Trenchard's support would be useful to him as he was about to launch a press campaign against Sir Douglas Haig and
Sir William Robertson, the
Chief of the Imperial General Staff. On hearing this Trenchard flatly refused the position, being personally loyal to Haig and antipathetic to political intrigue. Rothermere and his brother
Lord Northcliffe, who was also present, then spent over 12 hours acrimoniously debating with Trenchard. The brothers pointed out that if Trenchard refused, they would use the fact to attack Haig on the
false premise that Haig had refused to release Trenchard. Trenchard defended in the debate Haig's policy of constant attacks on the Western Front, arguing that it had been preferable to standing on the defensive, and he himself also had maintained an offensive posture throughout the war which, like the infantry, had resulted in the Flying Corps taking extremely heavy casualties. In the end, the brothers wore Trenchard down, and he accepted the post on the condition that he first be permitted to consult with Haig. After meeting with Haig, Trenchard wrote to Rothermere, accepting the post.
Disputes and resignation The New Year saw Trenchard made a
Knight Commander of the Order of the Bath, and he was appointed Chief of the Air Staff During his first month at the Air Ministry he clashed with Rothermere over several issues. First, Rothermere's tendency to disregard his professional advisors in favour of outside experts irritated Trenchard. Secondly, Rothermere insisted that Trenchard claim as many men for the newly formed
Royal Air Force as possible, even if they might be better employed in the other services. Thirdly, Rothermere and Trenchard disagreed on nominees for senior appointments in the RAF. Finally and most significantly, they disagreed over proper future use of air power, which Trenchard judged as being vital in preventing a repeat of the strategic stalemate which had occurred along the Western Front. Also during this period, Trenchard resisted pressure from several press barons to support an "air warfare scheme"; this would have seen the British armies withdrawn from France, and an attempt to defeat Germany entrusted to the RAF. Despite the differences with Rothermere, Trenchard was able to put in place planning for the merger of the Royal Flying Corps and the
Royal Naval Air Service. However, as the weeks went on they became increasingly estranged personally, and a low point was reached in mid-March when Trenchard discovered that Rothermere had promised the Navy 4000 aircraft for anti-submarine duties. He accorded the highest priority to air operations on the Western Front's land campaign: there were fewer than 400 spare aircraft in the United Kingdom. On 18 March they exchanged letters, Trenchard expressing his dissatisfaction and Rothermere curtly replying. The following day Trenchard sent Rothermere a letter of resignation. and although Rothermere asked him to remain, Trenchard only agreed to defer the date until after 1 April 1918, when the
Royal Air Force would officially come into being. After the Germans overran the British
Fifth Army on 21 March 1918, Trenchard ordered all available reserves of aircrew, engines and aircraft to be speedily transported to France. Reports reached him on 26 March that concentrations of Flying Corps' machines were assisting in stopping German advances. On 5 April, Trenchard travelled to France, inspecting squadrons and updating his understanding of the air situation. On his return, he briefed the Prime Minister,
David Lloyd George, and several other ministers on air activity and the general situation in France. On 10 April, Rothermere informed Trenchard that the War Cabinet had accepted his resignation, and Trenchard was offered his old job in France. He refused the offer, saying that replacing Salmond at the height of battle would be "damnable". Three days later Major-General
Frederick Sykes replaced him as Chief of the Air Staff. On the following Monday, Trenchard was summoned to
Buckingham Palace where
King George listened to his account of the events which caused him to resign. Trenchard then wrote to the Prime Minister stating the facts of his case and pointing out that in the course of the affair, Rothermere had stated his intention to resign also. Trenchard's letter was circulated among the Cabinet, with a vindictive response written by Rothermere. Around the same time, the question of Rothermere's general competence as Air Minister was brought to the attention of Lloyd George. Rothermere, realising his situation, offered his resignation, which was made public on 25 April 1918.
In-between duties In the weeks that followed his resignation, Trenchard was without a role and he kept a low profile, avoiding the Press and making no public comments. The new Air Minister,
Sir William Weir, under pressure to find a position for Trenchard, offered him command of the yet to be formed
Independent Force, which was to conduct long-range bombing operations against Germany. Instead, Trenchard, seeking equal status with Sykes, argued for a re-organisation of the RAF which would have seen him appointed as the RAF's commander of fighting operations, while Sykes would have been left to deal with administrative matters. Weir did not accept his proposal and instead gave Trenchard several options. Trenchard rejected the offer of a proposed new post which would have meant a London-based command of the bombing operations conducted from Ochey, arguing that the responsibility was Newall's under the direction of Salmond. He also turned down the post of Grand Co-ordinator of British and American air policy, and that of Inspector General of the RAF overseas. Weir then offered him command of all
air force units in the Middle East, or the post of
Inspector-General of the RAF at home, but strongly encouraged him to take command of the independent long-range bombing forces in France. Trenchard had many reasons for not accepting any of these posts, which he saw as titular, with little value and lacking practical authority. On 8 May 1918 Trenchard was sitting on a bench in
Green Park when he overheard a naval officer saying to another: "I don't know why the Government should pander to a man who threw in his hand at the height of a battle, if I'd my way with Trenchard I'd have him shot."
Commander of the Independent Air Force After a period of what was officially termed "special duty" in France, Trenchard was appointed General Officer Commanding of the Independent Air Force on 15 June 1918, with his headquarters in
Nancy, France. Initially, the French general
Ferdinand Foch, as the newly appointed Supreme Allied Commander, refused to recognize the Independent Air Force, which caused some logistical difficulties. The problems were resolved after a meeting of Trenchard and General
de Castelnau, who disregarded the concerns about the status of the Independent Air Force and did not block the much-needed supplies. Trenchard also improved the links between the RAF and the
American Air Service, providing advanced tuition in bombing techniques to the newly arriving American aviators. In September 1918, Trenchard's Force indirectly supported the American Air Service during the
Battle of Saint-Mihiel, attacking German airfields in that sector of the front, along with supply depots and rail lines. Trenchard's close co-operation with the Americans and the French was formalized when his command was redesignated the Inter-Allied Independent Air Force in late October 1918, and placed directly under the orders of
Foch. When the November 1918 armistice came, Trenchard sought permission from Foch to return his squadrons to British command, which was granted. Trenchard was succeeded as commander of the Independent Air Force by his deputy
Brigadier-General Courtney. Trenchard departed France in mid-November 1918 and returned to England to take a holiday. ==Between the wars==