How did cancer chemotherapy evolve from chemical weapons

For this assignment, your question will, of course, be about a question about chemical weapons, and it must be in the natural sciences (that is, you are not asking about the history of chemical warfare, the cultural or psychological effects of these weapons, nor political questions about their use).
How did cancer chemotherapy evolve from chemical weapons? This question requires 100% focus on the experiments that led to the discovery of nitrogen mustard chemotherapy.
Scholarly articles from Google Scholar to find full-text peer-reviewed articles in the natural sciences
References page that includes the articles you have selected using CSE citation-sequence style.