Question: In which war was this historical figure who is fictionalized in the 1970 novel by Lois Duncan involved?

Context articles: Lois Duncan
Killing Mr. Griffin
Ransom (Duncan novel)
Love Song for Joyce
Gallows Hill (novel)
Locked in Time
A Promise for Joyce
Point of Violence
Peggy Shippen
Peggy (novel)

Lois Duncan Steinmetz (April 28, 1934 – June 15, 2016), known as Lois Duncan, was an American writer, novelist, poet, and journalist.
 She is best known for her young-adult novels, and has been credited by historians as a pioneering figure in the development of young adult fiction, particularly in the genres of horror, thriller, and suspense.
Killing Mr. Griffin is a 1978 suspense novel by Lois Duncan about a group of teenage students at a New Mexico high school who plan to kidnap their strict English teacher, Mr. Griffin.
 Duncan developed the story from the character of Mark, who is involved in the kidnapping plan and is based on the first boyfriend of Duncan's oldest daughter.
 Mr. Griffin was based on the personality of a teacher one of Duncan's daughters had in high school.
 In 2010, the novel was reissued with changes to modernize the content.
Ransom (reprinted under the title Five Were Missing) is a 1966 thriller novel by Lois Duncan.
 Its plot follows a group of children who are kidnapped and held hostage on a school bus.
 It marked Duncan's first foray into the suspense and thriller genre, and was nominated for an Edgar Allan Poe Award.
Love Song for Joyce is a 1958 début novel by Lois Duncan, under the pen name Lois Kerry.
 The plot follows a young woman's struggle transitioning from adolescence to adulthood after moving from her hometown in Florida to attend a North Carolina college.
 The plot appears to be semi-autobiographical, bearing similarities to Duncan's own life.
Gallows Hill (1997) is a supernatural thriller novel for young adults by Lois Duncan.
 It was her first and only young adult novel written after the death of her daughter.
 It was written eight years after her previous young adult novel, "Don't Look Behind You".
 It is about a girl who moves to a small town with a secret.
Locked in Time is a 1985 suspense novel by Lois Duncan.
 The story centers around Nore, a seventeen-year-old girl who moves into a new home during the summer with her father Chuck, stepmother Lisette, stepbrother Gabe, and stepsister Josie.
 Soon after she meets her stepmother, stepbrother, and stepsister for the first time, Nore begins to suspect something is not quite right about her stepfamily and later discovers they never age.
 Duncan says she developed the idea for the novel when one of her daughters was thirteen years old and was having issues with her body image.
 Duncan says her daughter was "taking everything out" on her, and she began to wonder what it would be like if her daughter never outgrew her adolescence.
A Promise for Joyce is a 1959 novel by Lois Duncan, under the pen name Lois Kerry.
 It is a sequel to her debut novel, "Love Song for Joyce" (1958).
Point of Violence is a 1966 thriller novel by Lois Duncan.
 It is one of Duncan's few novels written primarily for adults.
 It follows a young widow who finds herself being stalked while hiding at a remote beach house after the murder of her husband.
Margaret "Peggy" Shippen (July 11, 1760 – August 24, 1804) was the second wife of General Benedict Arnold.
 Shippen garnered notoriety for being the highest-paid spy in the American Revolution.
Peggy is a 1970 historical novel by Lois Duncan.
 It is a semi-fictionalized account of the life of Peggy Shippen, the second wife of General Benedict Arnold, a prominent figure in Philadelphia after the American Revolutionary War.