Turner scored as Hull won at home for the first time in five games
Hull reached the fifth round of the FA Cup for the first time since 1989 with victory over League One Millwall.
Michael Turner headed Hull in front from Andy Dawson's free-kick but Marc Laird missed with a great chance for Millwall on the stroke of half-time.
Hull keeper Tony Warner had earlier stumbled as he tried to control a backpass and only just managed to fall on the ball with Izale McLeod lurking.
Ian Ashbee sealed the victory with a right-foot shot late on.
It was a match marred by sporadic crowd trouble inside the KC Stadium, while the tie itself was rarely inspiring.
The two sides are separated by 39 league places but there was little between them on the day.
Phil Brown's Hull won for the first time in five home fixtures and, having lost five of their previous seven games in all competitions, it was a welcome victory for the Tigers boss even if the Premier League remains his top priority.
Brown showed that the Cup is of secondary importance to him this season by making six changes from the team that lost to Arsenal in the league.
Warner, a former Lions player, made his debut in goal while striker Manucho, on loan from Manchester United, made his first start and left-back Dawson returned after missing two months through injury.
Angola international Manucho had few opportunities to make a positive impression and his look of frustration after he shot wide in the first half told its own story.
Warner looked less than convincing and was almost involved in a moment of excruciating embarrassment when he lost his balance trying to deal with Ashbee's backpass.
The keeper managed to fall on the ball before McLeod could knock it into an empty net but, with the incident happening inside the Hull penalty area, referee Stuart Attwell awarded Millwall an indirect free-kick from which Lewis Grabban shot wide.
Hull's opener came after 15 minutes when Turner got across the Lions defence and headed past David Forde.
But the home team were handed a real let off when Laird failed to score after McLeod had headed a David Martin cross into his path.
Clear openings were at a premium but Ashbee sealed victory with his brilliant strike in the closing minutes.
The Tigers had hit Millwall on the break, with Daniel Cousin picking out Ashbee 20 yards from the opposition goal.
Hull boss Phil Brown:
"I was pleased with the performance and the way we applied ourselves.
"Kenny has come here with a game-plan and made it very difficult for us to get any fluency in our game.
"That is credit to them but the bottom line is that little bit of quality in front of goal has paid off for us.
"It was always going to be about a thorough, professional approach and I think that is what we have seen."
Millwall boss Kenny Jackett:
"I'm disappointed to lose the game. Up until their second goal we were in it, the second goal killed us off.
"It was quite a scrappy game, which maybe suited the away side and the side from the lower divisions.
"From that point of view it was an opportunity we did not capitalise on."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.