Corporal Arthur William Dennison

[Guest gazela1]

Hi another new guy on the block.

Corporal Arthur William Dennison West Yorks Regiment reg no 21/582 East Yorks Regiment reg D/11857

Have my grandads mic,i understand most of it but am at a loss with the 7.7.39

rank,also the numbers 857/42 ? 9 ? 15/6/42.

Anybody any idea's what the remarks actually say,have downloaded his mic.

Any help would be greatly appreciated