Schalke incurred the wrath of their fans for a poor first-half showing as they were held 1-1 by promoted Ingolstadt at the Arena AufSchalke.Tobias Levels gave Ingolstadt the lead five minutes before half-time, turning the ball in with the outside of his boots and ensuring the home team entered the dressing room to whistles from their supporters at the interval.The Royal Blues were much improved in the second 45 minutes, but Ingolstadt packed men in behind the ball and defended resolutely.Schalke nevertheless made the breakthrough with just over 10 minutes remaining, Leroy Sane heading in Eric Maxim Choupo-Moting's cross to salvage a point for Andre Breitenreiter's men.