question:  Arthur Machen was a Welsh author and mystic of the 1890s and early 20th century well known for his leading role in creating the legend of the Angels of Mons, a popular legend about a group of angels who supposedly protected members of what army?
answer: the British Army
context: Title: Rockdale (Fallston, Maryland)
  Passage: Rockdale, also known as The Robinson/Stirling Place, is a historic home and farm complex located at Fallston, Harford County, Maryland, United States.  It is a farm developed from the late 18th century through the early 20th century.  The dwelling is in three parts.  The east room of the east wing is the earliest section dating from the 18th century.  The largest or main portion of the dwelling dates from between 1815 and 1830.  The north wing, a bay centered in the south façade of the second story, and a small conservatory, date from the very early 20th century.  The main house is five bays in length, two and a half stories, of stone construction, stuccoed and scored.  The home is surrounded by several outbuildings, trees, and other plantings, and the remains of formal gardens and garden structures developed in the early 20th century.  It was the residence of William E. Robinson (1860-1935), an entrepreneur in the local canning industry.
  Title: Arthur Machen
  Passage: Arthur Machen ( ; 3 March 1863 – 15 December 1947) was a Welsh author and mystic of the 1890s and early 20th century.  He is best known for his influential supernatural, fantasy, and horror fiction.  His novella "The Great God Pan" (1890; 1894) has garnered a reputation as a classic of horror (Stephen King has called it "Maybe the best [horror story] in the English language").  He is also well known for his leading role in creating the legend of the Angels of Mons.
  Title: Angels of Mons
  Passage: The Angels of Mons is a popular legend about a group of angels who supposedly protected members of the British Army in the Battle of Mons at the outset of the First World War.
citations: Angels of Mons Arthur Machen