By December the article found its way to Mirzá Abu'l-Fazl in Beirut who wrote a fitting response to the attack on the Faith. Abu'l-Fazl signed it, and mailed it to 'Àbdu'l-Bahá, "so that He can, in his wisdom, decide what to do with it."

Àbdu'l-Bahá received the manuscript in New York on June 19, 1912. He had it translated and printed, and called it The Brilliant Proof. "Each one of you should have a copy," he told the Americans. "Read, memorize and reflect upon it. Then, when accusations and criticisms are advanced . . . you will be well armed." [239 Days Website]

"Each one of you should have a copy. Read, memorize and reflect upon it. Then, when accusations and criticisms are advanced . . . you will be well armed."[The Brilliant Proof]

The Brilliant Proof was first translated by Ali Kuli Khan and published by the Bahá'í News Service in Chicago in 1912 in which it said: "Written in response to published attacks on the Bahá'í Religion by the British clergyman Peter Z Easton" (1846-1915). [Collins7.15 p41]

Peter Easton (1846-1915) was a Presbyterian in the Synod of the Northeast in New York who had been stationed in Tabriz from 1873 to 1880. While Àbdul'Bahá was in England Easton attempted to meet and challenge him. He made those around him uncomfortable and 'Abdu'l-Bahá withdrew him to a private conversation and then after which he left. Later he was able to have printed a polemic attack on the religion, Bahaism — A Warning, in the Evangelical Christendom newspaper of London (Sept.-Oct. 1911 edition.) It was published in the Appendix of The Brilliant Proof (p70-80) [Bahaipedia]

For more on Peter Easton see Àbdu'l-Bahá (p149-152).

Lady Blomfield in her book The Chosen Highway (p183) described such a visit and the affect it had on Àbdu'l-Bahá.

Try also a shorter date like 1911-09-2 or 1911-09

try also the Chronology Canada — 1911-09-21 or 1911-09-2 or 1911-09