Definition: Generate an appropriate title for the given text. The generated title must be short and include the main topic of the text. The preferred titles are under fifteen words.
Input: About 600 tonnes of rubble fell from the 11th Century wall, which was under multiple ownership, on 11 November. There were no casualties, but sniffer dogs and a drone searched through the rubble amid fears people were trapped. Contractors working for East Sussex County Council used heavy machinery to pull down the wall onto nearby land, away from sites in Castle Ditch Lane. The council said it would work with partners including Lewes District Council and Historic England to carefully examine the rubble before removal, which it is hoped will provide clues as to why it fell. Historic England inspector Rebecca Lambert described the collapse of the boundary wall as "catastrophic". A spokeswoman for castle owners Sussex Archaeological Society said it was one of the last remaining sections of the historic defence wall, still at full height, that fell. Kevin Foster, East Sussex County Council operating officer, said the wall had been in "a dangerous position". "If it had collapsed it could have caused further damage to neighbouring buildings. "It's still too early to say why the wall collapsed originally." Mr Foster added that the wall was only a small part of a large site and Lewes Castle remained open to the public. Follow BBC South East on Facebook, on Twitter, and on Instagram. Send your story ideas to southeasttoday@bbc.co.uk.

Remains of Lewes Castle boundary wall toppled for safety reasons