Struma. On 27 December 1916 A and B Sqn (see below) were withdrawn from their respective divisions and 1/1st Surrey Yeomanry reformed as XVI Corps' cavalry regiment. By June 1917 casualties from malaria among troops in the Struma valley became unsupportable, so XVI Corps withdrew behind the river, leaving the Bulgarian side as a wide No man's land patrolled daily by the Surrey Yeomanry and 1/1st Derbyshire Yeomanry with the corps cyclists. On 22 July a squadron of the Surreys supported 1st Bn Royal Scots in a successful dawn raid on Homondos, four miles over the river. At the end of the fever season XVI Corps reoccupied the Bulgarian side of the river in October as its winter line: the open right flank was to be covered by constant patrolling by the Surrey and Derbyshire Yeomanry. This was carried out in a snowstorm on the night of 14 October, including a second raid on Homondos. The Struma Front remained relatively quiet until June 1918 when XVI Corps was relieved by Greek troops and moved to the Lake Doiran sector. The final Allied offensive began in September, with XVI attacking at the Third Battle of Doiran on 28 September without success. But by 22 September the Bulgarian front was crumbling, and XVI Corps HQ with its attached troops took over the left flank of the British Salonika Army (BSA) to continue the pursuit. On 24 September the Surrey Yeomanry were attached to 65th Brigade as the advanced guard of 22nd Division. The Yeomanry led the advance through rugged country and were shelled by several batteries, which forced them to dismount and continue on foot. Eventually the regiment had to give up the pursuit with its horses completely exhausted and without water.Next day it continued in support of the infantry until they too became exhausted. The Armistice of Salonica ended the fighting with Bulgaria on 30 September. The BSA then began advancing across Bulgaria to open a new front against the Turkish Army, but the Turks signed the Armistice of Mudros on 30 October. B Squadron B Squadron joined 28th Division at Magdalen Hill Camp on 22 December immediately after 27th Division had vacated it. The division embarked for the Western Front 15–18 January 1915 and went into the line alongside 27th Division in V Corps. Under the command of Maj G.O. Borwick, the squadron's experiences were similar to A Sqn, providing