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plural outriders
A guide or escort, especially one who rides in advance. quotations examples
Then they went from farmhouse to farmhouse, two little girls walking at the head of the procession as bridesmaids, and six or eight outriders galloping ahead on hobby-horses to announce their coming.
1890, James George Frazer, The Golden Bough, volume 2, page 91
One who rides out on horseback to inspect a ranch etc. examples
(figurative) A forerunner. quotations examples
The Winchester MP is something of an outrider for a new project now: moving his party into the space vacated by the Conservative shift to the right under Iain Duncan Smith.
2001 November 2, “Outrider for a new project”, in BBC News