At the outbreak of the war August 1914 the Australian Government decided to raise the all-volunteer Australian Imperial Force (AIF) consisting of 20,000 troops comprising an infantry division and a light horse brigade of three regiments to be used at the discretion of Britain.
These regiments were raised from volunteers for overseas service, as the provisions of the Defence Act did not allow conscripts to be deployed overseas.
Nevertheless, many of the recruits were drawn from the various militia light horse formations created as a consequence of the Kitchener Report 1910 and the introduction of Universal Training, although they were assigned to freshly raised units that were separate to the light horse regiments raised as part of the militia.
Initial enlistments outstripped expectations and, as a result, a total of three light horse brigades as well as two divisional cavalry regiments were formed in the early part of the war.

The 2nd Light Horse Brigade was raised as part of the 2nd Contingent of the AIF, which was hastily put together at the beginning of September 1914.
It was organised into three regiments – the 5th, 6th and 7th – each of approximately 520 men.
 The brigade's three regiments were drawn from Queensland (5th) and New South Wales (6th and 7th), although it had initially been proposed that the 7th would be recruited from Queensland, Western Australia and South Australia.
These units were raised throughout September and October, and the brigade embarked for the Middle East, departing from Sydney in December 1914.
 The band of the 6th Light Horse Regiment played So Long, written by patriotic Australian composer May Summerbelle, as they set sail.

Arriving in Egypt, in February 1915, training was undertaken at Maadi Camp, during which further drafts of reinforcements were received from Australia.
Training focused initially on individual skills, before progressing to collective training at squadron, regimental and eventually brigade level.
The brigade's commander was Colonel (later Brigadier General)  Granville De Laure Ryrie; he commanded the brigade throughout the war except for a temporary detachment during 1916.

During the early part of the war, the brigade was attached to the New Zealand and Australian Division.
 In mid-May 1915, the brigade was deployed to Gallipoli as reinforcements for the infantry that had landed in April, who had become pinned around a small perimeter around a beachhead at Anzac Cove; deployed in a dismounted role, the brigade was assigned as corps troops directly under the Australian and New Zealand Army Corps.
About a quarter of the strength of each light horse regiment remained in Egypt with their horses; however, additional reinforcements were provided prior to their arrival at Gallipoli, to bring them up to strength.

Upon arrival, the brigade was broken up due to concerns about the capacity of its staff, including its commander, Ryrie, and his brigade major; however, it was reformed in June after a new brigade major was appointed.
The regiments were pushed into the line, largely on the far right of the position and undertook mainly defensive roles throughout the remainder of the campaign.
During this time, the light horsemen undertook patrolling operations, manned outposts, carried out sniping and worked to dig trenches and lay down wire.
The 5th Light Horse Regiment in particular saw hard service around a position called Wilson's Lookout during October and November, during which time it was severely depleted by illness.
The brigade was relieved from its forward positions by infantry from John Monash's 4th Brigade in November, by which time winter had set in and it had begun snowing.
By 20 December, all three regiments were withdrawn from the peninsula, as part of the general withdrawal that followed the decision to abandon the position.
They were subsequently returned to Egypt, sailing via Mudros.
At the outbreak of the war August 1914 the Australian Government decided to raise the all-volunteer Australian Imperial Force (AIF) consisting of 20,000 troops comprising an infantry division and a light horse brigade of three regiments to be used at the discretion of Britain. These regiments were raised from volunteers for overseas service, as the provisions of the Defence Act did not allow conscripts to be deployed overseas. Nevertheless, many of the recruits were drawn from the various militia light horse formations created as a consequence of the Kitchener Report 1910 and the introduction of Universal Training, although they were assigned to freshly raised units that were separate to the light horse regiments raised as part of the militia. Initial enlistments outstripped expectations and, as a result, a total of three light horse brigades as well as two divisional cavalry regiments were formed in the early part of the war.
The 2nd Light Horse Brigade was raised as part of the 2nd Contingent of the AIF, which was hastily put together at the beginning of September 1914. It was organised into three regiments – the 5th, 6th and 7th – each of approximately 520 men.  The brigade's three regiments were drawn from Queensland (5th) and New South Wales (6th and 7th), although it had initially been proposed that the 7th would be recruited from Queensland, Western Australia and South Australia. These units were raised throughout September and October, and the brigade embarked for the Middle East, departing from Sydney in December 1914.  The band of the 6th Light Horse Regiment played So Long, written by patriotic Australian composer May Summerbelle, as they set sail.
Arriving in Egypt, in February 1915, training was undertaken at Maadi Camp, during which further drafts of reinforcements were received from Australia. Training focused initially on individual skills, before progressing to collective training at squadron, regimental and eventually brigade level. The brigade's commander was Colonel (later Brigadier General)  Granville De Laure Ryrie; he commanded the brigade throughout the war except for a temporary detachment during 1916.
During the early part of the war, the brigade was attached to the New Zealand and Australian Division.  In mid-May 1915, the brigade was deployed to Gallipoli as reinforcements for the infantry that had landed in April, who had become pinned around a small perimeter around a beachhead at Anzac Cove; deployed in a dismounted role, the brigade was assigned as corps troops directly under the Australian and New Zealand Army Corps. About a quarter of the strength of each light horse regiment remained in Egypt with their horses; however, additional reinforcements were provided prior to their arrival at Gallipoli, to bring them up to strength.
Upon arrival, the brigade was broken up due to concerns about the capacity of its staff, including its commander, Ryrie, and his brigade major; however, it was reformed in June after a new brigade major was appointed. The regiments were pushed into the line, largely on the far right of the position and undertook mainly defensive roles throughout the remainder of the campaign. During this time, the light horsemen undertook patrolling operations, manned outposts, carried out sniping and worked to dig trenches and lay down wire. The 5th Light Horse Regiment in particular saw hard service around a position called Wilson's Lookout during October and November, during which time it was severely depleted by illness. The brigade was relieved from its forward positions by infantry from John Monash's 4th Brigade in November, by which time winter had set in and it had begun snowing. By 20 December, all three regiments were withdrawn from the peninsula, as part of the general withdrawal that followed the decision to abandon the position. They were subsequently returned to Egypt, sailing via Mudros.
2nd Light Horse Brigade