Answer based on context:

After losing four games in a row, the Steelers went to Cleveland for a Thursday Night divisional match. In windy, below-freezing conditions, Browns kicker Phil Dawson hit a 29-yard field goal in the 1st quarter to give the Brown's an early 3-0 lead.  He would kick another 29-yarder in the 2nd quarter, and Chris Jennings had a 10-yard touchdown run to put the Browns up 13-0. Jeff Reed kicked a field goal before the half to put the Steelers on the board. They would go into halftime down 13-3. Jeff Reed would kick another field goal in the 3rd quarter to bring them within a touchdown. However, a scoreless 4th quarter by both teams led the Browns to their first win against the Steelers since 2003, becoming only the fourth team in NFL history to be at least 10 games under .500 and defeat the defending Super Bowl champions. With the loss, the Steelers fell to 6-7.  It was the first time since the 1987 New York Giants that a defending Super Bowl Champion team suffered five consecutive losses.

How manyy points did Cleveland lead by at halftime?
10