1848: The Báb is transfered to the fortress of Chihríq by orders of Hájí Mírzá Áqásí
Secret agents, however, charged to watch Ali Khan, informed Haji Mirza Aqasi of the turn events were taking, whereupon he immediately decided to transfer the Báb to the fortress of Chihriq (about April 10, 1848), surnamed by Him the Jabal-i-Shadid (the Grievous Mountain).
(Shoghi Effendi, God Passes By, p. 19)
1854: Bahá’u’lláh retreats to the Sulaymaniyah mountains within Kurdistan
Suddenly, and without informing any one even among the members of His own family, on the 12th of Rajab 1270 A.H. (April 10, 1854), He departed, accompanied by an attendant, a Muhammadan named Abu'l-Qasim-i-Hamadani, to whom He gave a sum of money, instructing him to act as a merchant and use it for his own purposes. Shortly after, that servant was attacked by thieves and killed, and Bahá'u'lláh was left entirely alone in His wanderings through the wastes of Kurdistan, a region whose sturdy and warlike people were known for their age-long hostility to the Persians, whom they regarded as seceders from the Faith of Islam, and from whom they differed in their outlook, race and language.
(Shoghi Effendi, God Passes By, p. 119)