- On 12 May 1915 reinforcements started to arrive. The first were Australian Light Horse (ALH) and New Zealand Mounted Rifle regiments; their horses were left in Egypt. These units were smaller than the standard infantry battalion numbering only about 500 men. Formations were:
" 1st Light Horse Brigade (NSW, Queensland, SA and Tasmanian Composite and Victorian regiments)
" New Zealand Mounted Rifles Brigade
On 19 May 1915 there were further reinforcements, again horses were left in Egypt. The reinforcements were:
" 2nd Light Horse Brigade (Queensland and NSW regiments)
" 3rd Light Horse Brigade (Victorian, SA and WA regiments)
On 11 August 1915, elements of 2nd Australian Division started to reinforce 1st Australian Division. 2nd Australian Division consisted of:
" 5th Brigade (NSW)
" 6th Brigade (Victoria)
" 7th Brigade (Queensland, Tasmania, SA and WA)
" 13th Australian Light Horse Regiment (Victoria)
Also in August 1915, 1st and 2nd Light Horse Brigades were strengthened by 11th Australian Light Horse Regiment (Queensland & South Australia) and 12th Australian Light Horse Regiment (NSW).
On 12 September 1915, 1st Australian Division handed over the position at Lone Pine to 2nd Australian Division.
The arrival of all of these reinforcements allowed the progressive resting of the sadly depleted original ANZAC units.