Valérien Ismaël made three changes from the XI that beat Rotherham United 5-0 before the international break, with Bachmann, Imrân Louza and Tom Ince coming in for Ben Hamer, Ismaël Koné and Yáser Asprilla.
The game’s first scoring opportunities fell to the Hornets with 10 minutes played. First, Mileta Rajović failed to connect cleanly with Ince’s cross after a neat build-up involving Jamal Lewis, and then moments later Louza struck over from outside the area.
At the other end, Wesley Hoedt found himself in the right place at the right time to make a vital block, with Kelechi Iheanacho ready to pounce from close range.
Louza tried his luck once again, this time curling a free-kick over the bar from almost the same position in which he scored at Blackpool just over a year ago.