Hello
I agree that the first abbreviation in the first image is Bullet Wound Left Forearm. The second abbreviation looks like "R. B. Wd" and I would guess this might be "Rifle Bullet Wound".
The last image summarises his postings and appointments. This shows that:
He joined the Gordon Highlanders at Aberdeen on 2 Nov 1914. The D in the first entry is for "Depot", as each regiment had a base depot that received recruits etc and then posted them out to a specific battalion. In this case, he was posted to the 8th Battalion, Gordon Highlanders joining them on 6 Nov 1914.
He was then appointed an Acting Lance Corporal with the 8th GH on 24 Sep 1915, but was then posted back to the Depot on 11 Oct 1915. This means that he was taken off the strength of his particular battalion and was allocated to the regimental depot for administrative purposes. This doesn't mean that he necessarily came back to the UK, and he could have been wounded. The first image indicates that he was wounded in
1916, but the files didn't always record everything in the right place - is there anything in the file to indicate that he has been ill or wounded in Sept/Oct
1915?
Whatever the reason for being attached to the depot in Oct 1915 was, he was posted to the 3rd Battalion, Gordon Highlanders on 1 Jan 1916, to the 8th Battalion on 9 Feb 1916, and to the 1/7th Battalion on 9 Sep 1916 under Army Order 204 of 1916.
This is around the time he was wounded to his left forearm and as a result of his hospitalisation, he was posted to the Depot again on 17 Nov 1916 (again this would have been for admin purposes to take him off the strength of his battalion). Once fit for renewed service, he was posted to the 1/6th Battalion on 16 May 1917, then moved again to the 1/5th Battalion on 2 Jun 1917 under Army Order 204 of 1916. Later the same month on 29 June 1917 he was deprived of his appointment as Acting Lance Corporal [which was an appointment rather than a rank, as his substantive rank would have remained Private].
Presumably due to his second period of hospitalisation in 1917, he was taken on strength of ? Depot on 19 Aug 1917, then transferred to the ? Command Depot at Randalstown on 4 Sep 1917. From there he was posted to the 4th Reserve Battalion of the Gordon Highlanders.
He was transferred from 4th Reserve Battalion to the Class W(T) Army Reserve on 29 Mar 1918, which I believe was the means by which men were released from army service to take up civilian employment where their skills were needed - although he remained a reservist and could be recalled to the army if they so required. See
https://www.longlongtrail.co.uk/soldiers/a-soldiers-life-1914-1918/enlisting-into-the-army/british-army-reserves-and-reservists/class-w-and-wt-army-reserve/ for more details.
Finally, he was formally discharged from the Army on 10 Jan 1919 as "surplus to military requirements, not having suffered impairment since entry into the service" - presumably the army considered that the wounds to his arm had not left any continuing impairment. The reference to Para 392 (xxva) KR is the relevant paragraph XXV (a) of King's Regulations which provided the authority for his discharge.
As he moved about a fair bit between battalions, this link will give you an idea of where each battalion was
https://www.longlongtrail.co.uk/army/regiments-and-corps/the-british-infantry-regiments-of-1914-1918/gordon-highlanders/Hope that helps!
Rockford