1918

“The South Irish Horse was a Special Reserve cavalry regiment of the British Army. Formed as an Imperial Yeomanry regiment in 1902 as the South of Ireland Imperial Yeomanry, it perpetuated a unit formed during the Second Boer War. It transferred to the Special Reserve (Cavalry) in 1908 and was renamed as the South Irish Horse. Having taken part in the fighting of World War I, it was disbanded after Irish Independence in 1922.”
- en.wikipedia.org/wiki/South_Irish_Horse

“taken in Russia?”
Sound unlikely

www.mordaunt.me.uk/my%20family%20history.html

They do look very cold, unusual to see troops wearing scarves?

Russia seems very unlikely.

“On 12 June 1922 King George V received at Windsor Castle representatives of the six disbanded Irish regiments. While five had long and distinguished service records, the South Irish Horse (SIH) had only been raised in 1902, as a result of the second Boer War, but too late to take part.
On the outbreak of The Great War a single squadron of the SIH was sent to Flanders which was involved in the retreat from Mons and the Marne and the early battles of Ypres, Neuve Chapelle. The remainder of the Regiment followed and over the next four years, won ten battle honours including Loos 1915, Somme 1916 and 1918, Albert, St Quentin, Courtrai and finally France and Flanders 1915-1918. Losses were severe and there were many acts of gallantry.”

www.naval-military-press.com/product/south-irish-horse-in...

Perhaps it's a sign of the times, but none of them could be described as tall. Maybe as they are wrapped up in layers of heavy clothing they appear as shorter?

Bathing is important no matter how small is the bath and where is happening.

The Australian Branch of the British Red Cross Society began on 13 August 1914 at Government House, Melbourne, nine days after the outbreak of the First World War. The Queensland Division was inaugurated just a day later, at a meeting at the Town Hall, Brisbane. Presiding over the meeting was Lady Morgan, and the Mayoress of Brisbane, Mrs. Jenkinson. Queensland’s Governor His Excellency Sir Hamilton Goold-Adams was the founding patron, and his wife, Lady Goold-Adams the founding president. Within weeks, 196 branches were established across Queensland, as the Society’s mission and ideals spread and thousands of people, mostly women, volunteered in towns all over the state. Joining the Society gave its volunteers a dutiful purpose and a sense that they could contribute to the war effort from the home front. Their tireless work provided money, clothing, comforts for the sick and wounded, and equipment for military hospitals in Queensland and overseas. The geographical distance between branches presented many challenges, and the nature of district activities was adapted for each branch location. Some branches held fundraising events, and knitted and sewed socks, towels, and vests, while others sewed uniforms, or put together comfort parcels containing soap, cigarettes, fruit cake, tinned foods, and handkerchiefs. Remote branches with few resources sometimes simply collected money. Source: www.slq.qld.gov.au/blog/red-cross-society-queensland