Lee Harding and an excellent Charlie Harris free-kick gave the Hornets a two-goal lead, amid torrential rain, at half-time.
But second half goals from Sports skipper Charlie Walker and James Hammond, from the penalty spot, saw the National League South outfit fightback to secure a replay.
Photographer Derek Martin, from Derek Martin Photography and Art, was there to catch the action.
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Action from Horsham v Eastbourne Borough in the FA Cup third qualifying round Photo: Derek Martin Photography and Art
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Action from Horsham v Eastbourne Borough in the FA Cup third qualifying round Photo: Derek Martin Photography and Art
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Action from Horsham v Eastbourne Borough in the FA Cup third qualifying round Photo: Derek Martin Photography and Art
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Action from Horsham v Eastbourne Borough in the FA Cup third qualifying round Photo: Derek Martin Photography and Art