It's poretty much as described. Soldiers in various military kit march by whilea crowd of onlookers watch.
It's another production by Mitchell and Kenyon, the Electrical Edwardians. Although they mostly stuck to taking shots of local events in north England, occasionally they wandered into Ireland; Manchester and Liverpool had large Irish populations, and a lot of their appeal at the time was showing people themselves and their neighbors on the screen of the local cinematograph.
As always, I'm shocked by the fact that everyone wears a hat of some description. Apparently being seen outdoors bareheaded was a major social gaffe. Strangely enough, no one looks at the camera, although there's one seedy-looking fellow in the lower left corner whose attention seems distracted from the event.