Chasing them around that site it seems 1 AS&H were in 81 Bde, 27th Div in Macedonia at the time of Arras.
2 AS&H were part of 98 Bde, 33rd Div attached to VII Corps (3rd Army) and took part in the Second Battle of the Scarpe (23rd - 24th April 1917) which was one part of the wider battle of Arras
3 & 4 AS&H were reserve & extra reserve respectively originally 'militia' but training & providing replacements for 1 & 2 as well as Home Defence.
5th - 9th AS&H were Territorials (the 1/5th, 2/5th denotes 'lines' ie 1/5th is first line, 2/5th and 3/5th were 2nd & 3rd line and provided training & replacements for the first line TF battalions
10th - 13th were 'new army' Bns the 'K' number giving the blocks of volunteering - 'K1' being the first 100,000 to volunteer under the 'Kitchener' scheme. 13th were the reserve formation for the other 3
14th was new army too but presumably an amalgamation of spare troops from 10-13th or may have been 'A4' boys - ie old enough for the army on volunteering but not old enough for overseas service
15th was the reserve bn for 10-13
16th was formed from 'provisional' Bn troops - previously medically unfit or TF soldiers who had refused overseas service (recovered/medical standards changed or that right of refusal removed once conscription was introduced). Not 'new army' as wiki has it but TF
17th only existed 3 weeks - possibly as it couldn't find full numbers or 14th (where its troops were sent) had taken heavy casualties
So the answer is 2 AH&H
Sorry it's such a smart **** answer, you either knew all this or could figure it out; I just got into working through it and typed away
R
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