Two large stones smashed the bedroom window of Chorley’s most popular councillors as they slept.
Thugs targeted Joyce and Ralph Snape’s bungalow on Collingwood Road at around 5am on Saturday.
Ralph said: “I thought a bomb had gone off - it was so loud.
“We think we have been targeted on a personal level, it wasn’t revellers coming home from a night out.”
The outer pane of the double-glazed window was smashed in the incident, which has been reported to police, so the rocks didn’t hit the couple.
“Our bed is right next to the window,” Joyce said. “So it could have caused some real damage if it went all the way through.
“The curtains were open in the living room, but were shut in the bedroom, so I think they knew that’s where we were.
“It’s very frightening, and it goes to show that serving the residents of Chorley doesn’t please everyone.
“We must have upset someone.”
Ralph added: “We’re not going to let this stop us; they’ve picked on the wrong people if they think they can drive us out like this.
“I’ve been a councillor for 36 years and nothing like this has happened before.
“It is worrying because you don’t expect it to happen in your own home, and I do think it’s personal.
“But like I said, we won’t be driven out.”
Joyce received more votes than any other councillor in Chorley and Preston at the elections in early May, with 1,279 votes for her Chorley North West seat.
In 2010, Ralph also walked away with the largest majority of any councillor in Lancashire, with 2,579 votes.
A police spokesman said: “The incident was reported to us at around 10am on Saturday, and two large stones had been thrown at the bay window.
“The offender(s) made off undetected, but we would ask anyone with information to call the police on the new 101 number.
“We are investigating this incident, and would appeal to anyone who saw something or has any details to come forward.”
Ralph and Joyce had insurance firms looking at the damage this week.