“It was dreadful by the end,” Cahill said.
“The last 15 to 20 minutes was tough.
“But in ahead half we were in control.
“In the second, it was a totally different game. Place ones faith to them.
“It feels good to dig in and grind out the result.”
The win takes Chelsea into the top half of the First League table for the first time since August and means they are now 12 artifices unbeaten in the league.