John Thomas Rodgers 10th York & Lancaster

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Hi

I've been researching my Great Great Grandfather John Thomas Rodgers WW1 service and have found his service records on ancestry. I have a few of questions about them that I was hoping someone on here would be able to help me with. He joined the 10th York & Lancaster in September 1914 being promoted to Lance Corporal before being put back down to Private soon after, in June 1918 he was transferred to the 6th Battalion York and Lancaster and the records show that when he was with 6th his specialist military qualifications was stretcher bearer, would he have been a stretcher bearer whilst he was with the 10th or is that something he could have been trained for part way through the war? My second question is about his brother Samuel who was also in the 10th he was wounded severely wounded Gun Shot Wound in 1916 and was sent home 26 June guessing that he would have been wounded in June 1916 where would he have been around this time? My last question again about Samuel after being wounded he was put in reserve and reading the his records some of them damaged or hard to read it seems he requested and was granted to return to his old job at the Silverwood colliery in Rotherham on light duties was this a common occurrence?

Any help or advice greatly appreciated.

Thanks