Having re-looked at my great great uncles marriage certificate , he married at Woolwich in 1863 and was then based at Woolwich barracks. What I originally thought said military training. the end looked squashed, it definitely says Military Train.
He had been a Groom in civilian life. So it makes sense that he could have been dealing with horses in the army. You don't think about the supply side of things being from horse drawn wagons at that time...
Then looking on the net at Curragh Camp, it seems that regiments were based there on rotation. Also in 1861 when my great great uncle was there, could have coincided with the time when the Prince of Wales later Edward V11 was there too.
Anonemouse