Value of horses
The right page tells how the O/C left his unit with 3 men and went on a 12-hour, 36-mile round trip to rescue one horse. This seems like an amazing waste of manpower (48 man-hours, using modern terminology!) for just one horse which they expected to have to bury when they found it. I'm sure that horses were valuable, but I wouldn't expect them to go to such an extent for so little reward. Maybe they simply had nothing better to do that day. The O/C could easily have appointed a lower-ranked officer or an NCO to lead the trip, but for some reason decided to go himself. It doesn't say how they made the trip- walking, horseback or in a vehicle, only that they "walked the horse back with us."
by cyngast moderator
The O/C had to go as he was the only veterinarian in the unit. Here's a quick description of the makeup of a mobile veterinary section: http://www.longlongtrail.co.uk/the-mobile-veterinary-section-mvs/ An injured horse from the horse artillery fell under his responsibility as a mobile veterinary unit for the 2nd Cavalry Division.
They probably made the trip on horseback as the unit didn't have any motor transport assigned to them.