Extract the answer to the question from the following context. Question: What was the result of the defense? Context: During the English Civil War the majority of Londoners supported the Parliamentary cause. After an initial advance by the Royalists in 1642 culminating in the battles of Brentford and Turnham Green, London was surrounded by defensive perimeter wall known as the Lines of Communication. The lines were built by an up to 20,000 people, and were completed in under two months. The fortifications failed their only test when the New Model Army entered London in 1647, and they were levelled by Parliament the same year.
----
Answer: The fortifications failed their only test when the New Model Army entered London in 1647

Extract the answer to the question from the following context. Question: Why was Napoleon places St. Jerome's Chapel for 21 years? Context: In 1840, Louis Philippe I obtained permission from the British to return Napoleon's remains to France. On 15 December 1840, a state funeral was held. The hearse proceeded from the Arc de Triomphe down the Champs-Elysees, across the Place de la Concorde to the Esplanade des Invalides and then to the cupola in St Jerome's Chapel, where it remained until the tomb designed by Louis Visconti was completed. In 1861, Napoleon's remains were entombed in a porphyry sarcophagus in the crypt under the dome at Les Invalides.
----
Answer: until the tomb designed by Louis Visconti was completed

Extract the answer to the question from the following context. Question: Which is smaller, viruses or human nerves? Context: Persistent infections occur because the body is unable to clear the organism after the initial infection. Persistent infections are characterized by the continual presence of the infectious organism, often as latent infection with occasional recurrent relapses of active infection. There are some viruses that can maintain a persistent infection by infecting different cells of the body. Some viruses once acquired never leave the body. A typical example is the herpes virus, which tends to hide in nerves and become reactivated when specific circumstances arise.
----
Answer:
viruses