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In page 2nd Mounted Division:

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On 10 August 1915, the division was reorganized as a dismounted formation in preparation for service at Gallipoli.[3] Each Yeomanry Regiment left a squadron headquarters and two troops (about 100 officers and men) in Egypt to look after the horses.[4] The artillery batteries and ammunition columns, signal troops, mobile veterinary sections, Mounted Brigade Transport and Supply Columns and two of the Field Ambulances were also left behind in Egypt. The Yeomanry Mounted Brigade, which was formed in Egypt in January 1915, was likewise dismounted and joined the division on 13 August as a fifth brigade.[5] The division entrained for Alexandria on 13 August, sailed the next day and reached Mudros on 17 August. It landed at Suvla Bay that night.[1]