Question: What did the WWI British cavalry division get converted to that contained the 1/1st Bedfordshire Yeomanry regiment ?

text: British cavalry during the First World War
British cavalry regiments , brigades , and divisions
Other units that served in British cavalry , brigades , divisions and corps during the war
The British cavalry were the first British Army units to see action during the First World War. Captain Hornby of the 4th (Royal Irish) Dragoon Guards is reputed to have been the first British soldier to kill a German soldier, using his sword, and Drummer Edward Thomas of the same regiment is reputed to have fired the first British shot shortly after 06:30 on 22 August 1914, near the Belgian village of Casteau. The following Battle of Mons was the first engagement fought by British soldiers in Western Europe since the Battle of Waterloo, ninety-nine years earlier. In the first year of the war in France nine cavalry brigades were formed for three British cavalry divisions. Other regiments served in six brigades of the two British Indian Army cavalry divisions that were formed for service on the Western Front. Three regiments also fought in the campaign in Mesopotamia, the only other theatre of the First World War where British cavalry served. The doctrine of the British cavalry had been highly influenced by their experiences in the Second Boer War fifteen years earlier, during which one commander had preferred using irregular units to the professional cavalry regiments. By necessity, cavalry doctrine had changed since then, with emphasis being placed on dismounted firepower and covering fire from the flanks, using machine guns and attached artillery, to support cavalry charges. Cavalrymen dominated the higher command positions within the British Army during the war. The only officers to command the British Expeditionary Force on the Western Front were both cavalrymen, while the original commander of the British Cavalry Division went on to command the Egyptian Expeditionary Force during the Palestine Campaign, and another cavalryman became the Chief of the Imperial General Staff. Altogether on the Western Front, five of the ten officers who commanded the five British armies were provided by the cavalry, while another ten commanded corps, and twenty-seven served as divisional commanders. Among other decorations for their valour, eight cavalrymen were awarded the Victoria Cross, Britain's highest award for bravery in the face of the enemy.
Regiment - Battery Brigade Division
1/1st Queen 's Own Oxfordshire Hussars 2nd Cavalry Brigade 4th Cavalry Brigade 1st Cavalry Division 2nd Cavalry Division
1/1st North Somerset Yeomanry 6th Cavalry Brigade 3rd Cavalry Division
1/1st Leicestershire Yeomanry 7th Cavalry Brigade 3rd Cavalry Division
1/1st Essex Yeomanry 8th Cavalry Brigade 3rd Cavalry Division
1/1st Bedfordshire Yeomanry 9th Cavalry Brigade 1st Cavalry Division
2nd Lancers ( Gardner 's Horse ) 5th ( Mhow ) Cavalry Brigade 2nd Indian Cavalry Division 5th Cavalry Division
3rd Skinner 's Horse 7th ( Meerut ) Cavalry Brigade 2nd Indian Cavalry Division 5th Cavalry Division
6th King Edward 's Own Cavalry 2nd ( Sialkot ) Cavalry Brigade 1st Indian Cavalry Division 4th Cavalry Division
9th Hodson 's Horse 3rd ( Ambala ) Cavalry Brigade 1st Indian Cavalry Division 4th Cavalry Division
18th King George 's Own Lancers 7th ( Meerut ) Cavalry Brigade 2nd Indian Cavalry Division 5th Cavalry Division
19th Lancers ( Fane 's Horse ) 2nd ( Sialkot ) Cavalry Brigade 1st Indian Cavalry Division 4th Cavalry Division
20th Deccan Horse 9th ( Secunderabad ) Cavalry Brigade 2nd Indian Cavalry Division 5th Cavalry Division
29th Lancers ( Deccan Horse ) 8th ( Lucknow ) Cavalry Brigade 1st Indian Cavalry Division 4th Cavalry Division
30th Lancers ( Gordon 's Horse ) 3rd ( Ambala ) Cavalry Brigade 1st Indian Cavalry Division 4th Cavalry Division
34th Prince Albert Victor 's Own Poona Horse 9th ( Secunderabad ) Cavalry Brigade 2nd Indian Cavalry Division 5th Cavalry Division
36th Jacob 's Horse 8th ( Lucknow ) Cavalry Brigade 1st Indian Cavalry Division 4th Cavalry Division
38th King George 's Own Central India Horse 5th ( Mhow ) Cavalry Brigade 2nd Indian Cavalry Division 5th Cavalry Division
Royal Canadian Dragoons Canadian Cavalry Brigade 5th Cavalry Division
Lord Strathcona 's Horse Canadian Cavalry Brigade 5th Cavalry Division
Fort Garry Horse Canadian Cavalry Brigade 5th Cavalry Division