Erickson:
Enver was seized with the idea of retaking Baghdad.He intended to accomplish this by forming the Yildirim Ordular Grubunu,or the Thunderbolt Army Group.Enver envisioned this force concentrating in upper Mesopotamia--from there the Yildirim army Group would conduct a grand offensive to retake Baghdad..Halil's Sixth Army would form one component..the second component would be the newly formed Seventh Army...the British,at Baghdad, would be caught in a pincers and would be destroyed..
Around September 1917 this grandiose scheme was called off by the more pressing needs in Palestine:
..Falkenhayn now advocated using the Yilidirim Group to throw the British back across the Suez Canal,before attempting to retake Baghdad..by the middle of September 1917 the ambitious plan to retake Baghdad was consigned to the scrap heap.Enver Pasa..made up his mind to take von Falkenhayn's advice and send the Yildirim army to Palestine first...October 1917..he then assigned both the Seventh and the [new]Eighth Armies to Falkenhayn's Yildirim Group.Falkenhayn also retained command and control of the Sixth Army in Mesopotamia...
Sent to the Gaza-Beersheba line,the Yildirim Group was routed and withdrew into Palestine.Falkenhayn was relieved of command in February 1918,replaced by Liman von Sanders.Falkenhayn ended the war in an adminstrative post in East Prussia.