The 13th Light Horse Regiment received many reinforcements throughout the course of the war. The regiment initially departed Melbourne on the SS Persic 28 May 1915.

Relieved of assignment to 4th Light Horse Brigade 26 August 1915 and assigned to 2nd Division as its divisional mounted regiment. On 10 March 1916 the establishment was changed to one light horse squadron per division. A, B and C Squadrons were reassigned to 2nd, 4th and 5th Divisions respectively and Headquarters and Machinegun Section were dispersed. When the establishment was again changed to have a single mounted regiment under corps control, it was decided to reassemble the regiment. Headquarters and Machinegun Section reformed at Tel El Kebir, Egypt in May 1916 and accompanied the 5th Division to France where the whole regiment was reassembled on 2 July1916. Assigned to I Anzac Corps from 2 July 1916 and Australian Corps from 2 March 1918.

• 1st Reinforcements departed Sydney SS Ceramic 25 June 1915,

• 2nd Reinforcements departed Melbourne SS Malakuta 23 September 1915,

• 3rd Reinforcements departed Melbourne SS Kyarra 20 August 1915,

• 4th Reinforcements departed Melbourne SS Hororata 27 September 1915,

• 5th Reinforcements departed Melbourne SS Ballarat 9 September 1915,

• 6th Reinforcements departed Melbourne SS Hawkes Bay 28 October 1915 and SS Ulysses 27 October 1915,

• 7th Reinforcements departed Melbourne SS Ceramic 23 November 1915,

• 8th Reinforcements departed Melbourne SS Clan MacCorquodale 6 May 1916,

• 9th Reinforcements departed Melbourne SS Ayrshire 3 July 1916,

• 10th Reinforcements departed Melbourne SS Themistocles 28 July 1916,

• 11th Reinforcements departed Melbourne SS Pera 23 September 1916,

• 2th Reinforcements departed Melbourne SS Borda 20 October 1916,

• 13th Reinforcements departed departed Melbourne SS Ulysses 25 October 1916,

• 14th Reinforcements departed Melbourne SS Persic 22 December 1916,

•  15th Reinforcements departed Melbourne SS Orsova 16 December 1916,

• 16th Reinforcements departed Melbourne SS Omrah 17 January 1917,

• 17th Reinforcements departed Melbourne SS Ascanius 11 May 1917,

• 18th Reinforcements departed Melbourne SS Suevic 21 June 1917,

• 19th Reinforcements departed Melbourne SS Themistocles 4 August 1917,

• 20th Reinforcements departed Melbourne SS Themistocles 4 August 1917,

•  21st Reinforcements departed Melbourne SS Nestor 21 November 1917,

• 22nd Reinforcements departed Melbourne SS Ulysses 22 December 1917,

•  23rd Reinforcements departed Sydney SS Wiltshire 2 February 1918.
  
  (http://www.unsw.adfa.edu.au/~rmallett/Light_Horse.html)

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