Goals from Idris El Mizouni (2), Armando Dobra, Aaron Connolly and Tony Springett turned a potentially tough afternoon into a relative comfortable one.

The home side gave themselves the perfect start when a cross from Fin Stevens found Dobra, who directed his header past goalkeeper Elliott Taylor after just six minutes.

Orient looked keen not to be one of the cup shocks of the afternoon, and Jaze Kabia nearly doubled their lead when his shot hit a post.

However, the second goal came on 25 minutes when Connolly picked up a short free-kick from Alex Gilbert and drilled his effort from just outside the box past Taylor.

The game was sealed for the League One side on 50 minutes when El Mizouni connected first time to a delivery from Somto Boniface.

National League North Harborough gave their support some cheer when substitute Paul Malone turned in a corner on 69 minutes.

The last word fell to Orient when sub Springett slotted home with nine minutes left, while El Mizouni netted his second deep into added time.