David Huber, 60, is the man who triggered a major security alarm on Tuesday at 7 p.m.
He is said to breed Hungarian Vizlas at his lonely Cumbrian cottage overlooking the fells.
After being searched and discovering a knife, the man was arrested on suspicion of possessing an offensive weapon. There were no reports of injuries, and the incident is not being investigated as a terrorist act.
According to Ade Adelekan, deputy assistant commissioner of the Met Police, the man contacted police and asked to see a soldier, but was told it was not feasible. He then started throwing cartridges through the gates.
While being arrested, he told officers to handle his rucksack with care, which resulted in a controlled explosion, according to Mr Adelekan.
